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The researchers studied the mice.

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请选择（15）处的最佳答案。

A. programs
B. parent
C. records
D. words

Blair hopes that the G8 countries will work together to reduce carbon emissions.（）

A. Right
B. Wrong
C. Not mentioned

A．schoolB．firmC．storeD．college

A. school
B. firm
C. store
D. college

请选择（5）处的最佳答案。

A. dependent
B. independent
C. sure
D. secure