题目内容

Only Jack thinks that the teacher has given them a hard task.

A. 对
B. 错

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They write an essay about the history of online shopping.

A. 对
B. 错

They can surf the Internet in their dorm right now.

A. 对
B. 错

的目的主要是检查设备是否能正常运转。

的目的是检查各种管线及密封设备的负载能力。

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