单项选择题

Aiming to retrieve the Mars rover Opportunity, engineers are imitating Mars surface conditions in a testing laboratory.

A．copying
B．mocking
C．simulating
D．pretending
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单项选择题
Because a degree from a good university is the means to a better job, education is one of the most sophisticated areas in Japanese fife.
A．complex
B．competitive
C．considerate
D．superficial
单项选择题
That gossip concerning them exploded at length after it had been simmering for a long time.
A．segment
B．sector
C．skeleton
D．scandal
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