单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
For one of the studies, scientists from Canada noted a sharp decrease in ______ kinds of great sharks since the nineteen eighties.

A．8
B．9
C．10
D．11

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Researchers stressed the soup must be low-calorie and based on stock, not ______ .

单项选择题

Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20. For one of the studies, scientists from Canada noted a sharp decrease in ______ kinds of great sharks since the nineteen eighties. 您的浏览器不支持 audio 元素。