单项选择题

Questions 21 to 22 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
What is the topic of the news

A．Air pollution.
B．Medicare in the U. S..
C．The component of smog.
D．Protection of environment.
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单项选择题
What kind of food can be kept when flooding happens
A．Boxes of juice.
B．Food in soft packaging.
C．Food in a waterproof container.
D．All-mental cans in good condition.
单项选择题
When did the fight begin
A．On Monday.
B．On Thursday.
C．On Friday.
D．On Saturday.
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