生物化学是研究生物体的（）、维持生命活动的各种（）及其（）的科学，即研究生命运动（）的科学。
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生物化学课程的内容主要包括三部分（）、（）和（）。
How does Mr. Green think of the trip?
A. Boring
B. Pleasant
C. Tired
D. Exciting
What is the change of the tour group from Canada?
A. Two people didn’t come.
B. One person didn’t come.
C. There are two more people in the group.
D. There is one more person in the group.
In order to give the tourists a good impression, the tour guide should offer （ ）service.
A. timely
B. enthusiastic
C. gracious
D. friendly
E. sincere
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