单项选择题

Passage Two

A. A substance often served with hot dogs.
B. A substance also known as N-nitroso compounds.
C. A substance causing cancer in lab animals.
D. A substance used to keep hot dogs fresh.

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单项选择题
A. Domestic economic crisis.B. Strikes in manufacturing industry.C. Domestic economic recession.D. Some jobs will be lost

A. Domestic economic crisis.
B. Strikes in manufacturing industry.
C. Domestic economic recession.
D. Some jobs will be lost
单项选择题
A. He thinks he has a natural gift for the headstand. B. He thinks the headstand is a splendid exercise. C. He practiced the headstand all day long yesterday. D. He couldn’t stand on his head alone yesterday.
A. He thinks he has a natural gift for the headstand.
B. He thinks the headstand is a splendid exercise.
C. He practiced the headstand all day long yesterday.
D. He couldn’t stand on his head alone yesterday.
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