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.

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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.

单项选择题

According to the author, the cell-phone industry must adopt a mind-set in order to

A．have better training and organization.
B．become an indispensable part in people's life.
C．build more advanced and efficient networks.
D．help customers to choose proper service.