单项选择题

The conversation tells us that（）

A．the man has never been to the library before, so he asks the librarian for help
B．it isn’t the first time for the man to ask the librarian to recommend books to him
C．the librarian is so kind-hearted as to recommend books to each subscriber
D．the man and the woman know each other very well

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单项选择题
The tests show the earlier in life a person hears a sound the longer it is （）

A. retained
B. preserved
C. remained
D. reserved
单项选择题
What measure was taken against bloods in London in 1980s（）

A. 50 underground stations were made waterproof.
B. A flood wall was built.
C. An alarm system was set up.
D. Rescue teams were formed.
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