单项选择题

Questions 32 to 35 are based on the passage you have just heard.

A. Because the water pressure is greater than air pressure.
B. Because the first Comets crashed in the water.
C. Because there is less damage when the explosion takes place under water.
D. Because it is the only way available for engineers to find out which part has cracked.
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单项选择题
A. They smile to cover embarrassment.B. It is an unusual and even suspicious behavior.C. They smile to show politeness.D. It is an expression of pleasure.

A. They smile to cover embarrassment.
B. It is an unusual and even suspicious behavior.
C. They smile to show politeness.
D. It is an expression of pleasure.
单项选择题
A. Call a friend.B. Work on his car.C. Take a taxi.D. Walk to work.

A. Call a friend.
B. Work on his car.
C. Take a taxi.
D. Walk to work.
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