单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
The scientists say one effect of shark fishing has been an estimated ______ decrease in some shark populations.

A．9%
B．19%
C．90%
D．99%

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单项选择题

单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. The scientists say one effect of shark fishing has been an estimated ______ decrease in some shark populations. 您的浏览器不支持 audio 元素。