单项选择题


Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．Sleep can strengthen memories.
B．Sleep can recover memories.
C．Sleep can protect memories against interference.
D．Sleep can harm memories.
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单项选择题
A．A snowstorm.B．An earthquake.C．A traffic accident.D．A hurricane.
A．A snowstorm.
B．An earthquake.
C．A traffic accident.
D．A hurricane.
单项选择题
A．Because they want to sell canteens,B．Because they want to educate the tourists about park conditions.C．Because the tourists may get sick or die from dehydration.D．Because the tourists may get lost.
A．Because they want to sell canteens,
B．Because they want to educate the tourists about park conditions.
C．Because the tourists may get sick or die from dehydration.
D．Because the tourists may get lost.
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