单项选择题

Questions 15-18

A. Its chemical elements must be studied.
B. Its temperature must be lowered.
C. Big spaceships must be built.
D. Its atmosphere must be changed.
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单项选择题
A. A minor mistake can have a huge influence. B. A slip of one’s pen can make important project. C. A minor mistake won’t cause a huge influence. D. One can neglect minor mistakes.
A. A minor mistake can have a huge influence.
B. A slip of one’s pen can make important project.
C. A minor mistake won’t cause a huge influence.
D. One can neglect minor mistakes.
单项选择题
A. At a fair. B. At a cafeteria. C. In a computer lab. D. In a shopping mall.
A. At a fair.
B. At a cafeteria.
C. In a computer lab.
D. In a shopping mall.
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