单项选择题

24()

A.or 
B.else 
C.and 
D.but

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Why is the air quality tested every day()

A. Just in case someone asks.
B. Scientists like to take tests.
C. Scientists are not very busy.
D. To keep track of pollution levels.
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How do we know that the costs are rising in California()

A. It said so in the newspaper.
B. Some people don’t believe it.
C. The governor sent out a press release.
D. A group of people studied the costs of raising a family.
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