单项选择题

Which of the following statements is true（）

A. Freedom from responsibilities helps reduce stress.
B. Stress is the direct cause of cancer.
C. The cause of stress is worthy of serious study.
D. Cancer is the number one killer in our society today.

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单项选择题

If one has accepted a dinner invitation, what should he do if he is to be late for the dinner（）

A. He should find an excuse.
B. He should ask for excuse.
C. He should say sorry.
D. He should telephone to explain his being late.

单项选择题

A lawyer’s income is usually very high, （） more than 200,000 dollars a year.

A. add up to
B. added up to
C. amounted to
D. amounting to