单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．Because 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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单项选择题
A．It’s similar to playing notes on a piano.B．It requires a night’s sleep.C．It’s similar to the way a computer stores information.D．It requires no sleep.
A．It’s similar to playing notes on a piano.
B．It requires a night’s sleep.
C．It’s similar to the way a computer stores information.
D．It requires no sleep.
单项选择题
A．Be unable to breathe.B．Be overcome by pressure.C．Become speechless.D．Be scared by pressure.
A．Be unable to breathe.
B．Be overcome by pressure.
C．Become speechless.
D．Be scared by pressure.
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