题目内容
3．A lot of fishdisappearwhen the lake is polluted．（appear）分析 当这个湖泊被污染了的时候，很多鱼就消失了．
解答 答案：disappear．
appear意思是"出现"；其反义词是disappear，意思是"消失"根据"the lake is polluted"这个湖泊被污染了，因此可知湖里的鱼就消失了．从句时态是一般现在时，所以主句也要用一般现在时．结合给出的英语提示appear，所以要用其反义词disappear来填空，故填disappear．
点评 首先要掌握appear和disappear的意思，然后结合具体的题目，就可以确定正确答案．
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14．Can we have too many friends？
How many friends do you have？Making a lot of friends makes you popular at school．Also，whenever you want to find someone for help，there is always a certain friend there．Now scientists suggest that parts of the brain in those with a higher number of friends are larger than those with （75）Afriends．
Scientists have studied the connection between brain size and social interactions （互动） on monkeys．They found that parts of the brain in more sociable monkeys were larger．They were better（76）D predicting the intentions （意图） of other monkeys．
As for humans，the researchers at McGill University，Canada，studied the differences between those with larger social groups，and those with smaller groups．The researchers studied 18people．In order to （77）B the size of each person's social group，the people were asked how many social interactions they'd had in the past month．
Then researchers looked at brain scans （扫描）．They found that，just like monkeys，parts of the brain in humans with larger social groups were larger．
Although long-term studies are needed to figure out（78）B social interaction caused these changes in the brain，scientists were sure about one thing：Some brain regions that are larger suggests other regions might be smaller，lead scientist Mary Ann Noonan said to LiveScience．
For example，if you're spending a lot of time with friends，you won't have much free time to learn other （79）A，such as playing the piano，Noonan said．These parts of the brain stay small．
So having too many friends is not always good．（80）C，it's difficult to maintain a lot of meaningful relationships．Maybe we should stick to a smaller，but closer，group of friends．
How many friends do you have？Making a lot of friends makes you popular at school．Also，whenever you want to find someone for help，there is always a certain friend there．Now scientists suggest that parts of the brain in those with a higher number of friends are larger than those with （75）Afriends．
Scientists have studied the connection between brain size and social interactions （互动） on monkeys．They found that parts of the brain in more sociable monkeys were larger．They were better（76）D predicting the intentions （意图） of other monkeys．
As for humans，the researchers at McGill University，Canada，studied the differences between those with larger social groups，and those with smaller groups．The researchers studied 18people．In order to （77）B the size of each person's social group，the people were asked how many social interactions they'd had in the past month．
Then researchers looked at brain scans （扫描）．They found that，just like monkeys，parts of the brain in humans with larger social groups were larger．
Although long-term studies are needed to figure out（78）B social interaction caused these changes in the brain，scientists were sure about one thing：Some brain regions that are larger suggests other regions might be smaller，lead scientist Mary Ann Noonan said to LiveScience．
For example，if you're spending a lot of time with friends，you won't have much free time to learn other （79）A，such as playing the piano，Noonan said．These parts of the brain stay small．
So having too many friends is not always good．（80）C，it's difficult to maintain a lot of meaningful relationships．Maybe we should stick to a smaller，but closer，group of friends．
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