单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．They develop their identities within peer groups.
B．They receive informal education.
C．They perform voluntary community services.
D．They participate in all kinds of extracurricular activities.
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单项选择题
A．Sleep can strengthen memories.B．Sleep can recover memories.C．Sleep can protect memories against interference.D．Sleep can harm memories.
A．Sleep can strengthen memories.
B．Sleep can recover memories.
C．Sleep can protect memories against interference.
D．Sleep can harm memories.
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．Became 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．Became the tourists may get lost.
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