单选题：The energy companies launched urgent studies of the Arctic e

题目内容：

The energy companies launched urgent studies of the Arctic environment. A．made
B．stressed
C．moved
D．started

参考答案：

答案解析：

He checked the luggage thoroughly to make sure that nothing

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软件生命周期是指（　　）。A．软件产品从提出、实现、使用维护到停止使用退役的过程 B．软件从需求分析、设计、实现到测试完成的过程 C．软件的开发过程 D．软件的

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