单项选择题

A. It must be in good condition.
B. It must be soft and comfortable.
C. It must be strong and durable.
D. It must be the right height.
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单项选择题
According to the passage, tornadoes can destroy buildings because the ______.
A. force of tornado increases the air pressure in a building
B. air pressure at the center of a tornado is as strong as over 172,000 pounds
C. weight of a tornado can crush a building’s roof when it passes overhead
D. air pressure inside a tornado is less than air pressure inside a building
单项选择题
A. Flight 607 is preparing to depart. B. The flight was cancelled because of snow. C. Due to the bad weather, the man will have to prolong his stay in Washington. D. The plane can’t land in Washington because of the snowstorm.
A. Flight 607 is preparing to depart.
B. The flight was cancelled because of snow.
C. Due to the bad weather, the man will have to prolong his stay in Washington.
D. The plane can’t land in Washington because of the snowstorm.
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