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【参考答案】

是上一代将种系特征传递给下一代的活动。

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单项选择题______ the project in time, the staff were working at weekends.

A. Competing

B. Having completed
C. To have completed

D. To complete

单项选择题It was believed that things would get worse, but（）it is they are getting better.

A. before
B. after
C. because
D. as

单项选择题—What did Maria say —（）.

A. Maria said that she likes their uniforms.
B. Maria said that she doesn't like their uniforms.
C. Maria said that she didn't like their uniforms.
D. Maria said that she was like their uniforms.

单项选择题—______ Your name again, please. —It's Bell Green.

A. I didn't quite catch you
B. I couldn't quite catch you
C. I don't hear you
D. It's your name

单项选择题Many people keep dogs as pets because dogs are regarded as（）friends to people.

A. lonely
B. only
C. loyal
D. fair