单项选择题

A．About 80 miles per second.
B．About 70 miles per second.
C．About 18 miles per second.
D．About 17 miler per second.
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单项选择题
A．Because both have a limited supply of air, water, and other resources.B．Because the Earth moves around the sun as fast as a spaceship.C．Because we can travel to outer space.D．Because the Earth never stops moving.
A．Because both have a limited supply of air, water, and other resources.
B．Because the Earth moves around the sun as fast as a spaceship.
C．Because we can travel to outer space.
D．Because the Earth never stops moving.
单项选择题
A．He was a brave soldier.B．He took war photographs.C．He painted portraits.D．He designed a portable camera.
A．He was a brave soldier.
B．He took war photographs.
C．He painted portraits.
D．He designed a portable camera.
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