单项选择题

People should stay away from caffeine after lunch because

A. its effect may linger for almost 10 hours.
B. it disturbs the way people feel in daytime.
C. it accelerates heartbeat and respiration.
D. they may want to take a catnap.
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单项选择题
What is the main idea of the news item
A. The space shuttle would be under close inspection.
B. One of the crew members failed to head home.
C. Unexpected weather delayed the landing of Endeavor.
D. The space shuttle made a smooth landing.
单项选择题
Numerous foreign talented engineers, scientists and entrepreneurs are attracted to Silicon Valley to do all of the following EXCEPT
A. look for fame.

B. become rich quickly.
C. take part in a technological revolution.
D. emigrate there.
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