单选题Although the Earth’s chemical composition had been studied for years, only toward the end of the nineteenth century _______ as a discipline in its own right.A when geochemistry was recognisedB was geochemistry recognisedC then recognised geochemistryD

题目
单选题
Although the Earth’s chemical composition had been studied for years, only toward the end of the nineteenth century _______ as a discipline in its own right.
A

when geochemistry was recognised

B

was geochemistry recognised

C

then recognised geochemistry

D

as geochemistry was recognized

相似考题

1.—I thougth you had English.—No. It has been useful in my work.A.studied B.dropped C.failed D.passed

2.--- Hi, Terry, can I use your computer for a while this afternoon?--- Sorry. __ . A． It' s repairedB． It has been repairedC． It's being repairedD． It had been repaired

3.（50）These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.

4.Passage ThreeMany theories about the origin of the ocean have been proposed by scientists. The most widely accepted one is that the earth at some time in its very early history became hot enough to melt the materials from which it was formed. While in this molten state, lighter rock-forming materials (造岩材料) floated on the surface of the heavier ones. Then, between four and a half four billion (十亿) years ago, the molten earth cooled sufficiently to form. a crust of rock that was many miles thick.Surrounding the earth was an unbroken canopy of clouds miles thick and made up mostly of water vapor. Rain falling toward the still-hot earth was heated to steam and rose to the clouds again. After many millions of years, as the earth continued to cool, its surface temperature fell below the boiling point of water. Rainwater could now remain on the earth, covering its whole surface except for the higher places on earth that had been formed from the lighter rock materials.In 1970, scientists had pieced together evidence that the lighter rock materials had formed one huge continent by a vast ocean. Then, about 200 million years ago, the great continent began to break up, the pieces moving slowly apart.The onrushing waters of the single huge ocean now entered and filled the spaces between the separating continents--and became the several oceans and seas we know today.41. This passage mainly talks about ______.A. the origin of the earthB. the origin of the oceanC. the history of the earthD. the forming of the earth's crust

参考答案和解析
正确答案： C
解析：
虽然人类已经对地球的化学成分进行了长达数年的研究，但是直到19世纪末地球化学才成为一门独立的学科。因为是only放在句首，所以句子要倒装，谓语提前。
更多“Although the Earth’s chemical composition had been studied f”相关问题

  • 第1题：

    Experiments of this kind ____ in both the U.S. and Europe well before the World War.

    A have conducted

    B have been conducted

    C had conducted

    D had been conducted


    参考答案：D

  • 第2题：

    It’s important that this problem()before any others.

    A、is settled

    B、be settled

    C、was settled

    D、had been settled


    正确答案：B

  • 第3题：

    Had he studied hard, he___ the exam.

    A、would pass

    B、could pass

    C、had passed

    D、.would have passed


    正确答案：D

  • 第4题：

    Since 1780, when the town’s first hat factory ______ in Danbury, Connecticut, the town has been a center for hat manufacturing in the United States.

    A、were established

    B、was establishing

    C、had been established

    D、was established


    参考答案：D

  • 第5题：

    What had been done to comply with the IBC.Code in terms of the carriage of liquid chemicals?()

    A.Building chemical tankers.

    B.Building sealed tankers

    C.Building pipelines

    D.Building tankers


    答案：A

  • 第6题：

    ____ just six months ago, Finson’s Grill has quickly become one of the most popular restaurants in Detion.

    A.Opened
    B.Had been opening
    C.Been opened
    D.To open

    答案：A
    解析：
    四个选项是动词open的几种时态。A选项为一般过去时；B选项为过去完成时；C选项为被动语态，意为“被打开”；D选项为一般将来时。题目意为“六个月前刚刚___的芬森的烧烤店很快就成为Detion最受欢迎的餐厅之一。”时间状语是six months ago，为过去时，因此选A。
    　　

  • 第7题：

    You would have passed the test if you （）.

    • A、Studied hard
    • B、would study hard
    • C、had studied hard
    • D、Have studied hard

    正确答案:C

  • 第8题：

    填空题
    It has been found that the adventurer “Swiftwater” Bill Gates had greatly influenced Jack London’s books.____

    正确答案： H
    解析：
    根据题干中“‘Swiftwater’ Bill Gates”可定位到H段。本段讲到，Jack London也加入了淘金热之中，他的书深受其北方经历和Bill Gates的影响，故匹配段落为H段。

  • 第9题：

    单选题
    Although Allen popularized the use of angst- ridden monologue in film, the device was not invented by him.
    A

    the device was not invented by him

    B

    the device had not been invented by him

    C

    he was not the inventor of the particular device

    D

    he would not have invented the device

    E

    he did not invent the device


    正确答案： B
    解析：
    因为两个从句有相同的主语，所以应使用平行结构。使得第二个从句与第一个从句平行应使用主动语态。

  • 第10题：

    单选题
    My friend Tanya ______ Japanese for six years before she ______ Japan. I’ve just received a letter from her. It says she has been studying Chinese for three months and ______ for China in a month.
    A

    had been studying; visited; is leaving    

    B

    studied; had visited; will live in

    C

    has studied; visited; would leave

    D

    was studying; has visited; leaves


    正确答案： C
    解析：
    我的朋友Tanya在去日本之前学了六年的日语，我刚收到她的信，信上说她已经学了三个月的汉语，在一个月后去中国。从题目中可知，Tanya现在正在学习汉语，在此之前去过日本，因而要用过去时，在去日本之前就已经在学习日语，去日本是过去的事，去日本之前学日语就是过去的过去，因此用过去完成进行时，强调动作的延续性“一直在学日语”；一个月后将要去中国，leaving表示将要发生的动作。

  • 第11题：

    单选题
    Three days later, the IOC announced that Johnson’s test had been positive and he had disgraced the sports movement.
    A

    dishonored

    B

    destroyed

    C

    discriminated

    D

    disguised


    正确答案： A
    解析：
    句意：三天后，国际奥委会宣布约翰逊的尿检呈阳性并称他玷污了这项体育活动。disgrace玷污，使蒙受耻辱。dishonor玷污，使蒙羞。destroy破坏。discriminate歧视。disguise伪装；掩饰。

  • 第12题：

    问答题
    Practice 3　　Science, in practice, depends far less on the experiments it prepares than on the preparedness of the minds of the men who watch the experiments. Sir Isaac Newton supposedly discovered gravity through the fall of an apple. Apples had been falling in many places for centuries and thousands of people had seen them fall. But Newton for years had been curious about the cause of the orbital motion of the moon and planets. What kept them in place? Why didn’t they fall out of the sky? The fact that the apple fell down toward the earth and not up into the tree answered the question he had been asking himself about those larger fruits of the heavens, the moon and the planets.

    正确答案：
    【参考译文】
    在实践中,科学与其说依靠事先准备的实验,不如说依靠实验观察者有所准备的头脑。艾萨克·牛顿爵士通过对苹果落地进行推理发现了重力。多少世纪以来,苹果一直在许多地方落到地面,成千上万个人看到苹果落地。而牛顿多年来一直对月球和行星绕轨道运行的起因感到好奇。是什么力量使得它们处于现在的位置呢?它们为什么不落到天空之外呢?苹果向下落到地上而不是向上飞到树上这一事实回答了牛顿长期以来对月球和行星所存有的疑问。月球和行星是苍天中更大的果实。
    解析： 暂无解析

  • 第13题：

    Hitoshi's father had been a () of a man with bushy eyebrows and shaggy hair.

    A、magic

    B、giant

    C、joyful

    D、sleepless


    参考答案：B

  • 第14题：

    Although he had studied very hard, John had hope of passing the exam.()

    A. little

    B. any

    C. a little

    D. some


    参考答案：A

  • 第15题：

    Professor Black had us _______ a composition every Friday.

    A、to write

    B、written

    C、wrote

    D、write


    参考答案：D

  • 第16题：

    If she had studied harder, she ____________.

    A、would succeed

    B、had succeeded

    C、should succeed

    D、would have succeeded


    正确答案：D

  • 第17题：

    --- Hi, Terry, can I use your computer for a while this afternoon?

    --- Sorry. .

    A. It' s repaired B. It has been repaired

    C. It's being repaired D. It had been repaired


    正确答案：C

  • 第18题：

    John and Mary（）for years before they got married.

    • A、had been in love
    • B、had broken up
    • C、had separated
    • D、had been divorced

    正确答案:A

  • 第19题：

    单选题
    A

    To examine the chemical elements in the Ice Age.

    B

    To look into the pattern of solar wind activity.

    C

    To analyze the composition of different trees.

    D

    To find out the origin of carbon-14 on Earth.


    正确答案： A
    解析：
    细节题。从录音结尾来看，科学家的主要目的是通过对树木年轮的考查来研究“solar wind activity”。

  • 第20题：

    单选题
    My friend Tanya _____ Japanese for six years before she _____ Japan. I’ve just received a letter from her. It says she has been studying Chinese for three months and _____ for China in a month.
    A

    had been studying; visited; is leaving

    B

    studied; had visited; will live in

    C

    has studied; visited; would leave

    D

    was studying; has visited; leaves


    正确答案： B
    解析：
    句意：我的朋友Tanya在去日本之前学了六年的日语，我刚收到她的信，信上说她已经学了三个月的汉语，在一个月后去中国。从题目中可知，Tanya现在正在学习汉语，在此之前去过日本，因而要用过去时，在去日本之前就已经在学习日语，去日本是过去的事，去日本之前学日语就是过去的过去，因此用过去完成进行时，强调动作的延续性“一直在学日语”；一个月后将要去中国，leaving表示将要发生的动作。

  • 第21题：

    单选题
    Richard's news report covering the conference was so（）that nothing had been omitted.
    A

    comprehensive

    B

    integrated

    C

    redundant

    D

    productive


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Although the Earth’s chemical composition had been studied for years, only toward the end of the nineteenth century _______ as a discipline in its own right.
    A

    when geochemistry was recognised

    B

    was geochemistry recognised

    C

    then recognised geochemistry

    D

    as geochemistry was recognized


    正确答案： B
    解析：
    虽然人类已经对地球的化学成分进行了长达数年的研究，但是直到19世纪末地球化学才成为一门独立的学科。因为是only放在句首，所以句子要倒装，谓语提前。

  • 第23题：

    单选题
    Although the lecture had already been on for five minutes, I still was not able to find a chair ______.
    A

    to sit

    B

    for to sit on

    C

    to sit on

    D

    for sitting


    正确答案： D
    解析：
    应该是sit on the chair，on介词不能省略，故为C。

  • 第24题：

    单选题
    What had happened to the man before?
    A

    He had been badly treated.

    B

    He had killed someone.

    C

    He had been searched.

    D

    He had been forbidden to get in touch with anyone.


    正确答案： A
    解析：
    文章第一段第三句提到“I fumbled in my pockets to see if there were any cigarettes, whichhad escaped their search.”作者翻遍了口袋，终于找到一支没被他们搜走的香烟。由此可推断，作者之前被人搜过身。故选C。

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