单项选择题

"Someone is at the door"."________"

A．What is it
B．Who is it
C．Who is he
D．Which one is it
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单项选择题
________ that the trade between the two countries reached its highest point.
A．During the 1960's
B．It was in the 1960's
C．That it was in the 1960's
D．It was the 1960's
单项选择题
We learn from the passage that________.
A．one doesn't need to take any medicine if he has a cold or the flu
B．aspirin should not be included in over-the-counter medicines for the flu
C．delayed treatment of the flu will harm the liver and central nervous system
D．over-the-counter drugs can be taken to ease the misery caused by a cold or the flu
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