单项选择题

If you walk fast for 30 minutes every day, how many calories will be used for one week

A．100.
B．700.
C．1,400.
D．200.
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Which is not mentioned as one of the advantages of walking in this passage
A．It can help you lose weight.
B．It gives you more energy.
C．It's cheap.
D．It helps to increase your appetit
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Which of the following statement is true according to the first paragraph
A．Edison received the first American patent.
B．Edison got the most patents in America at that time.
C．Edison was the only American inventor.
D．Edison was the first American inventor.
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