单项选择题

Jane was nervous________.

A．because she was worried about the birthday party
B．because she found this history course very challenging
C．because she thought her term paper might be late
D．because she had a very hard time sleeping
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单项选择题
How high from the victim’’s head should the water be poured
A．Fifteen minutes.
B．Two or three inches.
C．Immediately.
D．Into the inside comer of the eye.
单项选择题
What is the most dangerous thing about nitrous oxides
A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects.
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