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．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.
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.
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.
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