单项选择题


A．as well as
B．also
C．still
D．with
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单项选择题
A．ifB．so thatC．becauseD．when
A．if
B．so that
C．because
D．when
单项选择题
According to the passage, we need sharks because of the following except ______.
A．they are delicious food for us
B．they are companions of human beings
C．they can help rescue human beings
D．they can help improve human health
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