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【单选题】
代表心室复极的波是A.
P波
B.
QRS波
C.
ST段
D.
T波
E.
U波
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举一反三
【单选题】We carved their names on the stone so that younger generations could know what their forefathers______for the nation.
A.
did
B.
were doing
C.
had done
D.
have been doing
【单选题】From the this passage, we know that______.
A.
most of the married women don't care for their families
B.
every family prefers to have only one child
C.
the American family has changed a lot
D.
American parents expect their children to go to college
【单选题】From the last paragraph, we know that the hippie movement finally declined because most of the hippies
A.
turned to more active ways to reform. the society.
B.
deemed the social problems of their time incorrigible.
C.
simply dropped out of it as they grew older.
D.
gave up some of their original ideas.
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