Bee populations around the world have been declining. Scientists have searched for a long time for a reason __66__ so many bees are disappearing. This new research may be __67__ important clue. However, the British government does not want to stop the use of the pesticides that may prevent bees from learning. __68__ wants to carry out more tests to make sure pesticides are the real reason for the decrease in the number of bees. A spokeswoman from the Friends Of The Earth charity said the government must act __69__(soon) rather than later. “Bee health is far too urgent to wait __70__ more research has been completed. Controls should be placed on these pesticides until bee safety can be guaranteed，” she said.

　　61．________ 62.________ 63.________ 64.________ 65.________ 66.________ 67.________ 68.________ 69.________ 70.________

　　答案：

　　61．if　考查连词。if 引导条件状语从句。

　　62．used　考查过去分词。used by farmers 为过去分词作定语。

　　63．for　考查固定搭配。be responsible for“对……负责”。

　　64．survival　考查名词。survival“幸存”。

　　65．means　考查主谓一致。this为单数代词。

　　66．why 　考查关系副词。先行词为reason，定语从句中主系表结构完整，因此用why。

　　67．an 　考查冠词。important为元音开头，clue为单数可数名词。

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