单项选择题

The growth of cell-phone users declines because

A．cell-phones are unreliable.
B．cell-phones usually have poor quality.
C．the customer service is bad.
D．customers are not satisfied with cell-phone service.

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单项选择题

What is the text mainly about

A．The bad service in the US cell-phone industry.
B．The crisis in the US cell phone industry.
C．The conflicts among cell-phone companies in the US.
D．The price of the US cell-phone industry.

单项选择题

Michasson may NOT support the idea to

A．lower the recommended safe upper limit of vitamin A amount.
B．produce vitamin A supplement pills with less vitamin A in them.
C．prevent people from eating cereals in their everyday meals.
D．lower the amount of vitamin A in fortified food and supplements.