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【单选题】Sharks Perform a Service for Earth’s Waters It is hard to get people to think of sharks as anything but a deadly enemy. They are thought to (51) people frequently. Although these fish perform a v...
A.
weak
B.
little
C.
few
D.
great
【单选题】Sharks Perform a Service for Earth’s Waters It is hard to get people to think of sharks as anything but a deadly enemy. They are thought to (51) people frequently. Although these fish perform a v...
A.
food
B.
help
C.
friends
D.
trainers