单项选择题

What is the most important factor for a rocket to escape from the Earth

A．To travel as fast as it can.
B．To overcome the Earth gravity.
C．To get away from the air resistance.
D．To have strong power in its operation.
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单项选择题
There was a look of anger on Lord Northwood's face. Why
A．He was not expecting Pat at this early hour.
B．He knew Pat was coming for shooting.
C．He didn't like the poor Irishman at all.
D．Pat had not told him he would come.
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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