单项选择题

A．It can kill people.
B．it can damage forests and plants.
C．It can make it difficult to breathe.
D．It can damage steel and concrete.
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单项选择题
A．They don’t help sports players at all.B．They don’t live up to their fame.C．They may be comfortable but are too expensive.D．They are good for track and field sports but not for ball games.
A．They don’t help sports players at all.
B．They don’t live up to their fame.
C．They may be comfortable but are too expensive.
D．They are good for track and field sports but not for ball games.
单项选择题
A．Because she didn’t know how to use the new oven.B．Because there was something wrong with her oven.C．Because she wanted to have her refrigerator fixed.D．Because there is something wrong with the food.
A．Because she didn’t know how to use the new oven.
B．Because there was something wrong with her oven.
C．Because she wanted to have her refrigerator fixed.
D．Because there is something wrong with the food.
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