单项选择题

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

A. Animals were hurt by the black snow.
B. Pollutants are dangerous to people and animals.
C. A black snow of harmful pollutants fell on a town in Sweden.
D. Natural cycles of wildlife.
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单项选择题
A. Because someone spilled water on it. B. Because it was made of low quality metal. C. Because someone lost it. D. Because the standard for measuring had changed.
A. Because someone spilled water on it.
B. Because it was made of low quality metal.
C. Because someone lost it.
D. Because the standard for measuring had changed.
单项选择题
A. There are neither rivers nor streams.B. There is no grass all the year round.C. It is mainly bare rock with little grass.D. There are a few streams and rivers.
A. There are neither rivers nor streams.
B. There is no grass all the year round.
C. It is mainly bare rock with little grass.
D. There are a few streams and rivers.
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