单项选择题

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

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 requites no sleep.
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单项选择题
Clots can form when ______.
A．blood supply slows or stops
B．blood migrates to the lungs
C．blood is in deep veins
D．blood causes a pulmonary embolism
单项选择题
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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