单项选择题

Passage Two

A. They can make cancer more incurable.
B. They can increase the chance of getting cancer.
C. They contain substances damaging DNA.
D. They can produce DNA compound.

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单项选择题
A. To save money. B. To enhance international communication.C. To make their staff more competitive. D. To spur domestic economic development.
A. To save money.
B. To enhance international communication.
C. To make their staff more competitive.
D. To spur domestic economic development.
单项选择题
A. The man has broken school rules so that he will be expelled from school. B. The man performed poorly in his mid-term paper so his tutor wanted to talk to him. C. The man’s parents have been informed of his bad performance in his mid-term paper. D. The man has skipped too many classes to catch up with other classmates.
A. The man has broken school rules so that he will be expelled from school.
B. The man performed poorly in his mid-term paper so his tutor wanted to talk to him.
C. The man’s parents have been informed of his bad performance in his mid-term paper.
D. The man has skipped too many classes to catch up with other classmates.
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