单项选择题

A. He doesn’t have anything to do.
B. He believes she is wrong about the pick-up time.
C. Before lunch is a great time to pick up the document.
D. Time passes very quickly.
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单项选择题
A. The plane is safe even if two of its engines fail. B. There are three engines on each of the giant jet plane. C. There is an extra engine on each of the giant jet plane. D. The engines never fail on the giant jet plane.
A. The plane is safe even if two of its engines fail.
B. There are three engines on each of the giant jet plane.
C. There is an extra engine on each of the giant jet plane.
D. The engines never fail on the giant jet plane.
单项选择题
According to the author, who are the least likely to try drugs with serious side effects
A. Patients with a minor illness.

B. Patients who are financially poor.
C. Patients with bothersome symptoms.
D. Patients who suffer from deadly diseases.
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