Many fruits, like apples and bananas, are good for people.
A. that is
B. such as
C. except for
D. similar to
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The main reason for this is that people are living a happier life.
A. difficult
B. necessary
C. simple
D. chief
Many buildings for 2010 Expo have already been built in shanghai.
A. put up
B. missed
C. improved
D. memorized
Since you are overweight, you'd better go on a diet and have more exercise.
A. Given
B. Heard from
C. Now that
D. Started
纤维分解菌与自生固氮菌之间由于前者为后者提供碳源，后者为前者提供氮源而构成（）
A. 偏利共栖关系
B. 互利共栖关系
C. 共生关系
D. 寄生关系
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