单项选择题

As there is always the Earth's gravitational pull, people ______.

A．accept it without questioning it
B．never notice its presence
C．hardly think about how to use it
D．often try to escape from it
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单项选择题
How fast will a rocket go to escape completely from the Earth's gravity ______
A．Seventy miles per second.
B．Seven thousand miles per hour.
C．Twenty-five thousand miles per second.
D．Twenty-five thousand miles per hour.
单项选择题
You can't come in, ______ you are.
A．whichever
B．whoever
C．wherever
D．whenever
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