单项选择题

A．Its chemical elements must be studied.
B．Its temperature must be lowered.
C．Big spaceships must be built.
D．Its atmosphere must be changed.
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单项选择题
A．Her car is being repaired.B．Parking is difficult in the city.C．The cost of fuel has increased.D．She wants to help reduce pollution.
A．Her car is being repaired.
B．Parking is difficult in the city.
C．The cost of fuel has increased.
D．She wants to help reduce pollution.
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.
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