单项选择题

A．looking for
B．looking into
C．looking after
D．looking over
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单项选择题
A．compressedB．impressedC．obsessedD．repressed
A．compressed
B．impressed
C．obsessed
D．repressed
单项选择题
Why sharks are useful for humans
A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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