单项选择题

软件危机是大型软件开发中出现的现象，下列选项中的______是其主要表现。
①软件生产的复杂性。
②软件生产进度无法控制。
③软件生产高成本、无法控制。
④软件需求定义不准确。

A.全部
B．②和③
C．①、②和④
D．②和④

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From the writers experience, we can conclude that______.
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B．he is the only person who hates jogging
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D．jogging makes people feel greater than any other sport

A.
A．not
B.he
C.nothing
D.jogging

单项选择题

A．cancelled
B．approved
C．solved
D．added

A.cancelled
B.approved
C.solved
D．added