6．a　a significant amount of 为固定搭配，意为“大量的”。

　　7．compared　compared to 为固定搭配，意为“与……相比”。

　　8．One　根据上句的“two different control groups of mice”可判断此处用one。

　　9．lower　根据语境中的“than”可判断此处应为形容词的比较级。

　　10．possibly　设空处在句中作状语，故用副词形式。

　　Ⅱ.短文改错

　　(2016·辽师大附中高三模拟)Though great progress has been made in science these years, but there are still many people living in poor conditions. They make their lives by collecting and selling used thing. Their children cannot go to school because they have not enough money to send their children to there. Why you think so many people still suffer from poverty now? The answer lies on the population explosion. A president of a developing country once said, “It is us who are to blame for the poverty because we used to ‘produce’ child without limit.” Although this few words sound simple enough, they have clear pointed out one of the causes of the population explosion.

　　答案：第一句：去掉but

　　第二句：lives→living; thing→things

　　第三句：去掉there前面的to

　　第四句：Why后加do

　　第五句：on→in

　　第六句：us→we; child→children

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