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.
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单项选择题
A. Her colleagues. B. Her neighbors. C. Her friends. D. Her schoolmates.
A. Her colleagues.
B. Her neighbors.
C. Her friends.
D. Her schoolmates.
单项选择题
A. To find out how much air can be pumped into a plane. B. To find out how much air passengers need to breathe at certain altitudes. C. To find what would happen if the plane crashed in the water. D. To find out if there are any weak parts in the plane that would burst under pressure.
A. To find out how much air can be pumped into a plane.
B. To find out how much air passengers need to breathe at certain altitudes.
C. To find what would happen if the plane crashed in the water.
D. To find out if there are any weak parts in the plane that would burst under pressure.
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