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Some of these studies (have shown) that although some people have trouble (to fall asleep), others have an (equally) difficult time (waking up).
A．have shown
B．to fall asleep
C．equally
D．waking up
Studies have shown _____ teenagers often suffer from depression .
A.that
B.which
C.in which
D.in that
Studies have shown that students who take several tests learn more than _______________(看完资料只参加一次测试的学生).
According to the text, studies at leading universities have shown that
A．accident repeaters can be detected in advance.
B．accident repeaters are in trouble with collection agencies.
C．accident repeaters cannot be discovered on the basis of generally hostile attitudes.
D．accident repeaters drive entirely differently from the way they usually live.
Studies have shown that ________.
A) a tigress never attacks until attacked
B) the tigress is not as fierce as the tigers
C) a tiger usually fights another tiger to defend its own territory
D) the tiger is not an efficient hunter as is commonly described
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