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Questions 17-20 are based on the following passage. You now have 15 seconds to read Questions 17-20.
The study was carried out by scientists from ______ .

A．America and Australia
B．America and Canada
C．America and Austria
D．America and China

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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 study was carried out by scientists from ______ . 您的浏览器不支持 audio 元素。