单项选择题

Question 21 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news.
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单项选择题
Which day is originally the first day of a week
A．Monday.
B．Friday.
C．Saturday.
D．Sunday.
单项选择题
Why do people need to do arm exercises
A．Because their arms are too fat.
B．Because their arms are too flabby.
C．Because arm exercises can help lower the blood pressure.
D．Because arm exercises can keep them healthy.
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