单项选择题

The polar region is _______.

A．a good place to land at by airplane
B．a good place to fly over
C．a good place to travel to by land
D．a good place to live at
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单项选择题
It is delight to fly at the Pole because there _______.
A．planes fly higher than at the equator
B．the eyes can reach about 4,000 meters
C．planes are clear of bad weather
D．planes fly more quickly than at the equator
单项选择题
Today, compared with 1910 _______.
A．five times fewer patients die after being operated on
B．20 percent fewer of all operation patients die
C．20 percent of all operation patients recover
D．operation deaths have increased by 20 percent.
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