单项选择题


A．sources
B．resources
C．origins
D．ways
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单项选择题
A．formsB．benefitsC．comesD．judges
A．forms
B．benefits
C．comes
D．judges
单项选择题
The passage mainly discusses ______.
A．the number of people being attacked by sharks
B．the benefits of sharks to improving human health
C．the dangers sharks have brought to human beings
D．the relationship between sharks and human beings
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