单项选择题

A．To make coins lighter.
B．To conserve silver.
C．To use up surplus copper.
D．To make coins last longer.
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单项选择题
The article was written to explain______.
A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar weather interactions
D．the causes affecting weather
单项选择题
A．Because he wants to keep fit.B．Because he thinks it is a good way to relax.C．Because he wants to make more friends.D．Because he wants to teach others.
A．Because he wants to keep fit.
B．Because he thinks it is a good way to relax.
C．Because he wants to make more friends.
D．Because he wants to teach others.
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