单项选择题

A．It’s quite normal.
B．It’s too high.
C．It’s cheap indeed.
D．It could be cheaper.
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单项选择题
A．Because people might have to migrate there someday.B．Because it is very much like the earth.C．Because it is easier to explore than other planets.D．Because its atmosphere is different from that of the earth.
A．Because people might have to migrate there someday.
B．Because it is very much like the earth.
C．Because it is easier to explore than other planets.
D．Because its atmosphere is different from that of the earth.
填空题
Why is there widespread uneasiness and confusion when there is more than enough food to supply
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