单项选择题

What is the purpose of analyzing the speed of sound through the Pacific-Ocean（）

A．To determine whether the Earth’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depths of the ocean.
D．To measure the movement of waves on the ocean.

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单项选择题
What do we learn from the conversation（）

A．Mr. Smith will be replaced if he makes another mistake.
B．Mr. Smith is an admirable chief of the Asian Department.
C．Mr. Smith’s department is more successful than all the others.
D．Mr. Smith is seldom in his office.
单项选择题
What can we conclude from this conversation（）

A．The roof of the woman’s house needs to be repaired.
B．The roof of the man’s house has several bad leaks.
C．The woman’s bathroom was badly damaged.
D．The man works for a roofing company.
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