单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．Advertisers.
B．Manufacturers.
C．Customers.
D．Sellers.
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单项选择题
A．When there is a heavy rain.B．When fine weather continues.C．When a fog appears in the morning.D．When wet weather is coming.
A．When there is a heavy rain.
B．When fine weather continues.
C．When a fog appears in the morning.
D．When wet weather is coming.
单项选择题
According to Dr. Doris Mccubbrey, dieting is ______for weight control.
A．inessential
B．necessary
C．harmless
D．helpful
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