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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A．Became she had too many things with her.B．Because she was sick.C．Because she was quite lazy.D．Because she didn’t want to get sick at high altitudes.
A．Became she had too many things with her.
B．Because she was sick.
C．Because she was quite lazy.
D．Because she didn’t want to get sick at high altitudes.
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