单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

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.
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单项选择题
A．The dean of the art school.B．The editor of Ceramics Monthly.C．A skilled potter.D．A student in the pottery class.
A．The dean of the art school.
B．The editor of Ceramics Monthly.
C．A skilled potter.
D．A student in the pottery class.
单项选择题
A．Difficulty falling asleep.B．Excessive sleepiness.C．Frequent nightmares.D．Voluntary napping.
A．Difficulty falling asleep.
B．Excessive sleepiness.
C．Frequent nightmares.
D．Voluntary napping.
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