4．專家曾經(jīng)預測，至少需要一個世紀電腦才能擊敗人類對手，但結果表明十九年就足夠了．（before）The experts predicted that it would be at least one century before the human beings defeated computers，but the results showed that nineteen years was enough．．

分析 The experts predicted that it would be at least one century before the human beings defeated computers，but the results showed that nineteen years was enough．

解答 The experts predicted that it would be at least one century before the human beings defeated computers，but the results showed that nineteen years was enough．
根據(jù)句意"專家曾經(jīng)預測"以及"但結果表明"可知，這是對過去事實的敘述，所以用一般過去時即可．
本句為一個復雜的主從復合句，并兩次用到了賓語從句，以及before引導的時間狀語從句的運用．a(chǎn)t least至少．

點評 對于復合句的靈活運用更能體現(xiàn)出一個學生的能力，適當?shù)脑谝粋�句子中使用定語從句，賓語從句，介詞短語作狀語或者定語等結構．

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25．A．spreadsB．expandsC．coversD．runs
26．A．neverB．seldomC．oftenD．hardly
27．A．moveB．planC．replyD．thought
28．A．a(chǎn)fterB．beforeC．whenD．if
29．A．displayingB．presentingC．paintingD．representing
30．A．a(chǎn)ndB．butC．soD．or
31．A．carefulnessB．kindnessC．seriousnessD．hopefulness
32．A．everydayB．every dayC．somedayD．some day
33．A．shirtB．crownC．promiseD．joke
34．A．refer toB．deal withC．talk ofD．look for
35．A．prideB．interestC．signalsD．signs
36．A．ensureB．a(chǎn)dmitC．suggestD．a(chǎn)dvise
37．A．comfortableB．reasonableC．describableD．possible
38．A．realizationB．satisfactionC．recognitionD．consideration
39．A．In allB．In additionC．Above allD．As a result
40．A．instead ofB．more thanC．rather thanD．regardless of．

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