单项选择题

A．Two.
B．Three.
C．Four.
D．Five.
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单项选择题
A．His radio is worth the price.B．He’s never lowered the price.C．He offers the lowest price for his radio.D．He will lower the price if the woman insists.
A．His radio is worth the price.
B．He’s never lowered the price.
C．He offers the lowest price for his radio.
D．He will lower the price if the woman insists.
单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would______.
A．mean a warming up in the Arctic
B．raise the temperature of the earth's surface
C．prevent the sun's rays from reaching the earth's surface
D．account for great changes in the climate in the northern hemisphere
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