单项选择题

A．Difficulty falling asleep.
B．Excessive sleepiness.
C．Frequent nightmares.
D．Voluntary nappin
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单项选择题
A．It is slowed by the process of photosynthesis.B．It occurs only in certain areas.C．It takes millions of years.D．It is dependent on chemical compounds.
A．It is slowed by the process of photosynthesis.
B．It occurs only in certain areas.
C．It takes millions of years.
D．It is dependent on chemical compounds.
单项选择题
A．She had hoped for a better conclusion.B．Her committee hasn’t been very busy lately.C．This committee is better than the other one.D．She is pleased with the results.
A．She had hoped for a better conclusion.
B．Her committee hasn’t been very busy lately.
C．This committee is better than the other one.
D．She is pleased with the results.
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