单项选择题

高温高湿环境或极端高温干燥作业下常发生（）

A.热射病
B.热痉挛
C.热衰竭
D.日射病
E.混合型中暑

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With the Spring Festival （），the stores are crowded with people.

A.at the corner
B.round the corner
C.in the corner
D.on the corner
单项选择题
Television did not become very common（）the early 1960s.

A.unless
B.up to
C.onto
D.until
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