单项选择题

A．People can call you back if necessary.
B．You can dial a special number free.
C．You don’’t need to pay for long distance call.
D．You can get a credit coupon when you give the phone number.
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单项选择题
The least serious damage caused by acid rain is _________.
A．poisoning of plant roots
B．leaching of heavy metals
C．changing the blood chemistry in
D．corrosion of metal structures
单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
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