单项选择题

A．From the starting point back to the earth.
B．Several hundred kilometers.
C．A certain height.
D．About 50 kilometers.
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单项选择题
A．Disobedient.B．Stubborn.C．Optimistic.D．Naughty.
A．Disobedient.
B．Stubborn.
C．Optimistic.
D．Naughty.
单项选择题
A．Borrow some money.B．Buy a heater.C．Get some information.D．Pay the rent.
A．Borrow some money.
B．Buy a heater.
C．Get some information.
D．Pay the rent.
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