What problems are caused by too much homework?A. Get fat.B. Fight with each other.C. Feel stressed and get shortsighted.
题目
What problems are caused by too much homework?
A. Get fat.
B. Fight with each other.
C. Feel stressed and get shortsighted.
相似考题
更多“What problems are caused by too much homework?A. Get fat.B. Fight with each other.C. Feel stressed and get shortsighted.”相关问题
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第1题：
What were the people asked to do in the study?
A. To make a face at each other.
B. To get their faces impressive.
C. To classify some face pictures.
D. To observe the researchers' faces.
正确答案：C
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第2题：
9． Jim told me she had ________ ， homework to do and always ended up ‘Englishnew words every day．
A． too much; memorizing
B． too many; memorizing
C． much too; memorized
D． much many; to memorize
正确答案：A
，．A【解析】too much+不可数名词，意为“太多的”； end up doing表示“以……结束”。故答案为A。 -
第3题：
9． Watching TV too much can get ______the way of his study．
A．in
B．out
C．at
D．on
正确答案：A
9．A【解析】get in the way of。妨碍”，为固定短语。故答案为A。 -
第4题：
A
In China，more and more middle school students are getting shorter sleeping time than be-fore． Most students sleep less than nine hours every night，because they have much homework to do. Some homework is given by their teachers，and some by their parents． Also，some students don't know how to save time .They are not careful enough while they do their homework，so it takes them a Iot of time． Some students spend too much time watching TV or playing computer games．They stay up very late． Some students have to get up early every morning on weekdays to get to school on time by bus or by bike．lt can be a long way from home to school．
Schools and parents should cut down some of the homework so that our children can enjoy more than nine hours of sleep every night for their health． For children，we should make best use of our time． When we have enough time for sleeping，we will find it much better for both our study and health．
( )21． What makes most students sleep less than nine hours every night?
A． Watching TV．
B． Playing computer games．
C． Doing their homework．
D． Doing housework．
正确答案：C
21．C【解析】由第一段第二句可知由于做作业，大多数学生睡眠少于9小时。 -
第5题：
I’m afraid the homework is () for the children.A、too much
B、much too
C、too many
D、many too
参考答案：A
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第6题：
共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside, more than 8 hours a night.He added that“it might be a good idea”for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cautioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep questionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems.Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kridke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours.In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said.Paragraph 5______
A: Kripke's Research
B: Dangers of Habitual Shortages of Sleep
C: Criticism on Kripke's Report
D: A way of Overcoming Insomnia
E: Sleep Problems of Long and Short Sleepers
F: Classification of Sleep Problems答案：A解析：该段中只包含两个句子，而每个句子中提到了have trouble falling asleep“很难入睡”，这表明该段主题应与睡眠问题相关。选项E和选项F都直接提到了sleep problems “睡眠问题”，因此推测答案可能来自这两个选项。选项E意为“睡眠时间长的人和睡眠时间短的人遇到的睡眠问题”，选项F意为“睡眠问题的分类”。结合段落内容来看，段落第一句主要提到people who clock up 9 or 10 hours each weeknight“每晚睡9一10个小时的人即睡眠时间长的人”的情况，段落第二句主要提到people who slept only 7 hours each night“每晚只睡 7个小时的人即睡眠时间短的人”呼应，因此E是答案。
整个段落只包含一个句子，该句主要以前的研究揭示了慢性睡眠不足的潜在危险。这与B项“习惯性睡眠不足的危险”呼应一致。所以答案为B。
A和F容易相互成为干扰项，这对于该段主题的判断具有一定的迷惑性，但由于段落中提到的“睡眠问题”是属于问卷上要回答的内容，是和Kripke的直接研究有关，所以判断“Kripke的研究”是段落的主题，因此A是答案。
剩下的3个选项中，选项F作为第1小题的干扰项成为本小题答案的可能性很小，选项C意为“对Kripke报告的批评”，整个段落主要提到了Kripke的研究发现和他的看法： Kridke found ... (Kridke发现）;Kripke noted ... (Kripke指出……); he added...（他补充说……）, 根本没有涉及到对Kripke的批评，因此C是干扰项，答案应该为D。该段首先分析了睡眠时间长的人出现睡眠问题的原因，然后指出克服失眠（睡眠问题的具体表现）的一种方法。
利用题干中的名词短语。good night's rest和名词people作为定位线索，在文章中找到相关句：These findings, which DL Daniel Kripke reported in the journal Psycho-somatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night．依据该句可直接判断F项“睡眠超过8小时”是答案。
利用题干中的名词短语long sleepers作为定位线索，同时关注题干中的其他用词，这样在文章中找到相关句：Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight（与long sleepers呼应）appear to have more trouble falling and staying asleep,as well as a number of other sleep problems, than people who sleep 8 hours a night．依据该句可直接判断E项“出现睡眠问题”是答案。
利用题干中的名词短语one of the sleep problems, the middle of the night 作为定位线索，在文章中找到相关句：Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning. A项fall asleep again“再次入睡”是fall back to sleep的 近义结构，所以答案为A。
利用题干中的名词结构one survey, higher risk of dying作为定位线索，在 文章中找到相关句：one report（与 survey呼应）demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than peo-ple who sleep more．依据该句可直接判断C项“睡眠不足7个小时”是答案。 -
第7题：
While the trade fight isn’t affecting most of the economy yet in a big way，many industries are worried that the damage could quickly______。A.get lost
B.get better
C.get worse
D.get strong答案：C解析：本题考查动词词组辨析。题目意为“尽管贸易战尚未在很大程度上影响到大部分经济，但许多行业担心，危害情况可能变得更糟。”空格前出现了 “worried”，说明空格里的短语应该表示不好的含义。A选项“迷路，迷失”，B选项“变得更好，康复”，C选项“变得更糟糕，恶化”， D选项“变得强壮”。
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第8题：
共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night's sleep than 8-hour sleepers.
These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine, demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night. He added that it might be a good idea for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cautioned that more research is needed to confirm this.
Previous studies have shown the potential dangers of chronic shortages of sleep,for instance, one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
For the current report,Kripke reviewed the responses of 1,004 adults to sleep questionnaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems.Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours.In an interview,Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed."It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake,"he said.One of the sleep problems is waking in the middle of the night,unable to______.
A:fall asleep again
B:become more energetic the following day
C:sleep less than 7 hours
D:confirm those serious consequences
E:suffer sleep problems
F: sleep more than 8 hours答案：A解析：Investigators … found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling , than…该句回应了文章的主题―睡眠时间太长不是好事。对应被选项发现只有E和F与这个内容有关系，但段落最后一句中又提到了睡眠不足的人的问题，因此判断E（睡眠时间长和睡眠时间短的人所面临的睡眠问题）是答案。
第四段只有一句话：Previous studies have shown the potential dangers of chronic shortages of sleep , for instance…这句话表明了该段的中心是“长期睡眠不足的潜在危险“。因此选B。
第五段一开始就提到了Kripke的研究，但后来也说到Sleep problems included … A和F容易相互成为干扰项，具有一定的迷惑性。但由于段落中提到的“睡眠问题”属于Kripke的问卷上要回答的内容，和Kripke的研究有关，所以判断A是答案。
第六段中出现的Kripke found , Kripke noted和he added表明Kripke的观点和态度应该是该段的中心，对比被选项，排除C（段落中没有出现批评的话语）和F(段落中没有具体提到睡眠问题的表现形式），而该段倒数第二句中one way to help insomnia is to spend less time in bed(克服失眠的方法之一是少花时间在床上）与D呼应。
根据搭配结构need to do sth．判断所有选项都在语法上合适。因此要借助句意来判断，答案是F。
借助句意“根据报道，睡眠时间长的人更有可能……”，并结合文章主题（睡眠时间长不是好事情）判断E合适。也可借助文章中的相关内容（利用题干中的Long sleepers和 more likely作为答案线索）: Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours.
句意为“其中的一个睡眠问题是在半夜醒来，不能……”文章第五段倒数第一句话提到午夜醒来很难再次入睡，直接判断A合适。
句意：“一项调查显示那些习惯性每晚……的人有更高的死亡风险。”在第四段找到相关信息：people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more．判断C是答案。 -
第9题：
单选题Mother told the child_______too late.Anot get up
Bdo not get up
Cnot to get up
Dnot getting up
正确答案： A解析： -
第10题：
单选题What do race organizers often complain about?AThere are not enough sports facilities
BRunners get injured too easily
CFew women participate in running
正确答案： B解析：
说话者提到她决定开办跑步俱乐部是因为她实在受不race organizers的态度，因为他们总是在抱怨the lack of women in the sport但是也把这当作不提供独立更衣室的借口，因此选C。 -
第11题：
问答题Grandma sent Johnny some money for his birthday. Johnny spent all of it in five stores. In each store, he spent $1.00 more than half of what he had when he came in. How much money did he get from grandma?正确答案： $62解析：
解题要点就是Johnny最后一次花的钱就是他身上所剩的钱，假设他最后一次剩余X块钱。那么我们可以列出方程式：X/2 + 1 = X，这样就能解出X=2，依次往前类推，可以得出第一次的钱是62块。 -
第12题：
单选题The task is too much for me, so I can’t carry on _____ any longer. I must get some help.Asingly
Bsimply
Calone
Dlonely
正确答案： B解析：
句意：这个任务对于我来说太重了，我不再能够单独进行下去了。我需要帮助。alone作副词，修饰carry on，表示“单独，独自”。singly单一地。simply简单地。lonely是形容词，孤独的，寂寞的。 -
第13题：
What is one of the problems that David is facing now?
A. He is too young to get a credit card.
B. He has no time to learn driving.
C. He has very little spare time.
D. He will soon lose his job.
正确答案：A
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第14题：
22． What problems are caused by too much homework?
A． Feeling stressed and fighting with each other．
B． Feeling tired of study and getting fat．
C． Feeling stressed and getting short-sighted．
D． Getting short-sighted and feeling tired of study．
正确答案：C
22.C【解析】由原因栏可知大量的作业给学生很大的压力，同时也导致了很多学生近视。 -
第15题：
Stress is the feeling you get when you're really worried about something． This is the kind of worry that troubles you for hours，or even days．It makes you feel (11)，scared(恐惧的)，or angry． You may find it difficult to eat and sleep，or you might eat and sleep much(12) than usual． Stressing out will lead to serious 'problems like heart illness．(13) not all stress is bad for you． The good kind (14) your body and mind alert(机敏的) and can make you perform better，like when you're giving a speech to your class or running to the finish line．
What causes stress? Do you know(15) your dad is worried about the bills，or your mom is unhappy? Because they're stressed out! There are lots of things in your life that ,(16) cause stress-having too much homework，taking a test in a subject that you are not good (17) ，or hearing your parents argue!
There are some ways to (18) stress． If you're stressed out，try these quick and easy
ways to relaxt Take part in sports and out-of-class activities． Try to get at least eight hours of sleep every night． Eat a healthy，balanced (19) that includes all kinds of food． Talk with your close friends，family members or teachers: It'll make you feel better，and (20) may be able to give you advice and help you solve your problem．
( )11．
A．calm
B．excited
C．surprised
D．upset
正确答案：D
Ⅱ．11.D【解析】句意：压力使你感觉心烦、恐惧和恼怒。 其他三项均不合意。 -
第16题：
What is one of the problems that David is facing now?
A．He is too young to get a credit card.
B．He has no time to learn driving.
C．He has very little spare time.
D．He will soon lose his job.
正确答案：A
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第17题：
I tried phoning her office, but I couldn’t ___ A. get along B. get on C. get to D. get through
正确答案：D
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第18题：
共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling re-freshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night.He added that“it might be a good idea” for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cau-tioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep ques-tionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kripke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said.Paragraph 4______
A: Kripke's Research
B: Dangers of Habitual Shortages of Sleep
C: Criticism on Kripke's Report
D: A way of Overcoming Insomnia
E: Sleep Problems of Long and Short Sleepers
F: Classification of Sleep Problems答案：B解析：该段中只包含两个句子，而每个句子中提到了have trouble falling asleep“很难入睡”，这表明该段主题应与睡眠问题相关。选项E和选项F都直接提到了sleep problems “睡眠问题”，因此推测答案可能来自这两个选项。选项E意为“睡眠时间长的人和睡眠时间短的人遇到的睡眠问题”，选项F意为“睡眠问题的分类”。结合段落内容来看，段落第一句主要提到people who clock up 9 or 10 hours each weeknight“每晚睡9-10个小时的人即睡眠时间长的人”的情况，段落第二句主要提到people who slept only 7 hours each night“每晚只睡 7个小时的人即睡眠时间短的人”呼应，因此E是答案。
整个段落只包含一个句子，该句主要提到以前的研究揭示了慢性睡眠不足的潜在危险。这与B项“习惯性睡眠不足的危险”呼应一致。所以答案为B。
A和F容易相互成为干扰项，这对于该段主题的判断具有一定的迷惑性，但由于段落中提到的“睡眠问题”是属于问卷上要回答的内容，是和Kripke的研究直接有关，所以判断“Kripke的研究”是段落的主题，因此A是答案。
剩下的3个选项中，选项F作为第1小题的干扰项成为本小题答案的可能性很小，选项C意为“对Kripke报告的批评”，整个段落主要提到了Kripke的研究发现和他的看法：Kripke found... (Kripke发现）; Kripke noted... (Kripke指出…); he added...（他补充说…），根本没有涉及到对Kripke的批评，因此C是干扰项，答案应该为D。该段首先分析了睡眠时间长的人出现睡眠问题的原因，然后指出克服失眠（睡眠问题的具体表现）的一种方法。
利用题干中的名词短语a good night's rest和名词people作为定位线索，在文章中找到相关句：These findings, which DL Daniel Kripke reported in the journal Psycho-somatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night．依据该句可直接判断F项“睡眠超过8小时”是答案。
利用题干中的名词短语long sleepers作为定位线索，同时关注题干中的其他用词，这样在文章中找到相关句：Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight（与long sleepers呼应）appear to have more trouble falling and staying asleep,as well as a number of other sleep problems, than people who sleep 8 hours a night．依据该句可直接判断E项“出现睡眠问题”是答案。
利用题干中的名词短语one of the sleep problems, the middle of the night 作为定位线索，在文章中找到相关句：sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning. A项fall asleep again“再次入睡”是fall back to sleep的近，义结构，所以答案为A。
利用题干中的名词结构one survey, higher risk of dying作为定位线索，在文章中找到相关句：one report（与 survey呼应）demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than peo-ple who sleep more．依据该句可直接判断C项“睡眠不足7个小时”是答案。 -
第19题：
共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night's sleep than 8-hour sleepers.
These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine, demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night. He added that it might be a good idea for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cautioned that more research is needed to confirm this.
Previous studies have shown the potential dangers of chronic shortages of sleep,for instance, one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
For the current report,Kripke reviewed the responses of 1,004 adults to sleep questionnaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems.Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours.In an interview,Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed."It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake,"he said.To get a good night's rest,people may not need to______.
A:fall asleep again
B:become more energetic the following day
C:sleep less than 7 hours
D:confirm those serious consequences
E:suffer sleep problems
F: sleep more than 8 hours答案：F解析：Investigators … found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling , than…该句回应了文章的主题―睡眠时间太长不是好事。对应被选项发现只有E和F与这个内容有关系，但段落最后一句中又提到了睡眠不足的人的问题，因此判断E（睡眠时间长和睡眠时间短的人所面临的睡眠问题）是答案。
第四段只有一句话：Previous studies have shown the potential dangers of chronic shortages of sleep , for instance…这句话表明了该段的中心是“长期睡眠不足的潜在危险“。因此选B。
第五段一开始就提到了Kripke的研究，但后来也说到Sleep problems included … A和F容易相互成为干扰项，具有一定的迷惑性。但由于段落中提到的“睡眠问题”属于Kripke的问卷上要回答的内容，和Kripke的研究有关，所以判断A是答案。
第六段中出现的Kripke found , Kripke noted和he added表明Kripke的观点和态度应该是该段的中心，对比被选项，排除C（段落中没有出现批评的话语）和F(段落中没有具体提到睡眠问题的表现形式），而该段倒数第二句中one way to help insomnia is to spend less time in bed(克服失眠的方法之一是少花时间在床上）与D呼应。
根据搭配结构need to do sth．判断所有选项都在语法上合适。因此要借助句意来判断，答案是F。
借助句意“根据报道，睡眠时间长的人更有可能……”，并结合文章主题（睡眠时间长不是好事情）判断E合适。也可借助文章中的相关内容（利用题干中的Long sleepers和 more likely作为答案线索）: Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours.
句意为“其中的一个睡眠问题是在半夜醒来，不能……”文章第五段倒数第一句话提到午夜醒来很难再次入睡，直接判断A合适。
句意：“一项调查显示那些习惯性每晚……的人有更高的死亡风险。”在第四段找到相关信息：people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more．判断C是答案。 -
第20题：
You will soon（）the weather here, and then the changes in temperature will not trouble you much.
- A、get used to
- B、get over
- C、get to
- D、get on with
正确答案:A -
第21题：
单选题—______pocket money do you usually get every month?—Fifty yuan. What about you?AHow often
BHow long
CHow many
DHow much
正确答案： D解析：
句意：“你每月有多少零花钱？”“五十元。你呢？”由题意可知，问题是问多少钱，钱是不可数名词，用how much。How often表示频率，how long表示空间距离。因此选择D项。 -
第22题：
单选题It can be painful for parents when their children feel out of sync with others, but it is unwise_______ on the importance of fitting in; children get enough of that message in the outside world.Alaying a lot of importance
Bto put too much emphasis
Cto give a large amount of concern
Dthrowing a great deal of anxiety
正确答案： A解析：
当孩子与其他的孩子不同步的时候，时常让父母感到头疼，但一味的强调适应的重要性也是不明智的，孩子从外界得到的那种信息已经够多了。put emphasis on强调。 -
第23题：
单选题Until recently, body heat has caused problems because it _____.Awas difficult to collect
Bcame in a variety of forms
Cwas difficult to get rid of
Dtended to be absorbed by physical objects
正确答案： B解析：