单项选择题

Questions 7 and 8 are based on the following news. At the end of the news item, you will be given 20 seconds to answer the questions. How many parents knew about the school choice option at some urban schools

A. 1%.
B. 25%.
C. 17%.
D. 50%.
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The word alkaline in the first paragraph means（）.

A. containing a substance which has the chemical behavior of an acid< br>B. containing a substance which has the opposite effect to an acid< br>C. tasting of salt< br>D. containing a substance which has the chemical behavior of salt
单项选择题
How can we prevent getting a cold or flu according to the doctor
A. Taking antibiotics.
B. Having more sleep.
C. Staying away from it.
D. Working out regularly.
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