C. the technology has been put into practice

　　D. scientists have unlocked these crets of memory

　　【参考答案】1—5、ACACB

　　短文改错

　　Last Sunday, Tom and I were walking down the street while we 1．

　　saw an old man fell off his bike. Many people crowded ．

　　around him. Someone suggested carrying an old

　　．

　　man to hospital, but Tom did not agree. He has learnt ．

　　first aid, so she said that they mustn’t move him. They ought to leave ．

　　him where he was and checked him first. At this time the old man ．

　　wasn’t breathing. I called in first aid center at once and he began ．

　　to start the old man’s breathing, use the mouth-to-mouth way. 8．

　　Soon the old man began to move a little and doctors also ．

　　arrived. They said that we had done was right.

　　．

　　．while-when考查状语从句的连接词。根据文意此处为“这时，突然”之意，故用when。

　　．fell-fall考查非谓语动词的用法。根据see sb do sth可知用fall。

　　．an-the考查冠词的用法。第二次提到那位老人应用定冠词the。

　　．has-had考查动词时态。根据文意他在上个星期六之前他就学会了急救，故用过去完成时。

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