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It is important for astronauts to exercise in order to keep their muscles fit.

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比较说明几种基本操作系统类型的实现方式和特点

来自动植物疫区的船舶、飞机、火车等运输工具，经检疫发现有禁止进境的动植物、动植物产品和其他检疫物的，口岸出入境检验检疫机构必须进行封存、退回或者销毁处理。 ( )

A. 对
B. 错

Scientists aim to develop technology that can recognise psychological states.

S3. What does the phrase “on unframed picture to his subordinates" mean__________