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问题详情：

Not all memories are sweet. Some people spend all 36 lives trying to forget bad experiences. Now American researchers are developing a pill,     37     will help people forget bad memories. The pill is planned to be taken immediately after a 38                                                                               (frighten) experience. They hope it might reduce, or possibly erase, the effect of painful memories.

However, the new research has caused a lot of argument. Supporters say bad memories may

ruin people’s lives. They come back      39     us when we don’t want to have them in a daydream or nightmare( 噩 梦 ). They usually come with very painful feelings. The pill can help to reduce many    40    (suffer). But those    41     are against the research say that changing memories      42    (be) very dangerous because memories show who we are.

            43        the drug could first be used in only very serious cases, some people even fear that it would become more commonly used. Don’t forget people always have the ability     44 (use) science for the wrong purpose. What we should do is help people to have                                                             45             (good) control of memories.

【回答】

36. their          37 which           38 frightening            39 to            40 sufferings

41 who            42 is                 43 Although/ Though          44 to use         45 better

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