单项选择题

A．Eliminating the errors in prices.
B．Saving store clerks’ time to do checking out.
C．Giving the customer an itemized printout.
D．Punching the item price into the cash register.
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单项选择题
A．The impact of the Internet on our health.B．The damages caused to a web-addict.C．The increased computer use.D．The vast information on the Internet.
A．The impact of the Internet on our health.
B．The damages caused to a web-addict.
C．The increased computer use.
D．The vast information on the Internet.
单项选择题
A．She’ll be able to go aboard a spacecraft.B．She’ll be able to operate the Mission Control.C．She’ll be able to receive messages from satellites.D．She’ll be able to learn something new about space.
A．She’ll be able to go aboard a spacecraft.
B．She’ll be able to operate the Mission Control.
C．She’ll be able to receive messages from satellites.
D．She’ll be able to learn something new about space.
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