填空题We can see the importance of adaptation when bad times strike.____

资料：When we see well，we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are.
People who are near-sighted can only see things that are very close to their eyes，Everything else seems blurry（=unclear）.Many people who do a lot of work，such as writing，reading and sewing become near-sighted.
People who are far-sighted suffer from just the opposite problem. They can see things that are far away，but they have difficulty in reading a book unless they hold it at arm’s length. If they want to do much reading，they must get glasses，too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism. This，too，can be corrected by glasses. Some people’s eyes become cloudy because of cataracts. Long ago these people often became blind. Now，however，it is possible to operate on the cataracts and remove them.
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself，look at an object out of one eye；Then look at the same object out of your other eye. You will find the object’s relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.

We should take good care of our eyes______.

A.even if we can see well
B.only when we cannot see perfectly
C.only when we realize how important our eyes are
D.only when we can see well

We can make mistakes at any age.Some mistakes we make are about money.But most mistakes?are about people."Did Jerry really care when I broke up with Helen?When I got that great job,did Jim really feel good about it,as a friend?Or did he envy my luck?"When we look back,doubts?like these can make us feel bad.But when we look back,it′s too late.
Why do we go wrong about our friends or our enemies?Sometimes what people say hides their?real meaning.And if we don′t really listen closely we miss the feeling behind the words.Suppose?someone tells you,"You′re a lucky dog."That′s being friendly.But"lucky dog"?There′s a bit?of envy in those words.Maybe he doesn′t see it himself.But bringing in the"dog"puts you down a?little.What he may be saying is that he doesn′t think you deserve your luck.
"Just think of all the things you have to be thankful for"is another noise that says one thing and?means another.It could mean that the speaker is trying to get you to see your problem as part of your life as a whole.But is be?Wrapped up in this phrase is the thought that your problem isn′t important.It′s telling you to think of all the starving people in the world when you haven′t got a date for Saturday night.How can you tell the real meaning behind someone′s words?One way is to take a good look at?the person talking.Do his words fit the way he looks?Does what he says agree with the tone of?voice?His posture?The look in his eyes?Stop and think.The minute you spend thinking about the?real meaning of what people say to you may save another mistake.

According to the author′,the reason why we go wrong about our friends is that

A.we fail to listen carefully when they talk
B.people tend to be annoyed when we check what they say
C.people usually state one thing but mean another
D.we tend to doubt What.our friends say

（ ）When we saw his face，we knew_______was bad.

A.the news
B.some news
C.a news
D.news