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[单选题]

Earth has an atmosphere, which protects the surface from harmful rays.

A.winners in the 26.2-mile race on all seven continents

B.people who enjoy long running as a lifestyle activity

C.running racers satisfied with their own performance

D.old people who live an active life after retirement

参考答案与解析：

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    • Earth has an atmosphere, which protects the surface from harmful rays.