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问题 选择题

You will fail your next exam ______ you start to work hard at your study now.

A．because

B．unless

C．so

D．if

答案

答案：B

考查连词的用法。句意：你下次考试会不及格的，除非你现在开始努力学习。所以选unless 除非。

单项选择题

下列哪条血管的病变可以导致闭锁综合征（）

A.颈内动脉

B.大脑前动脉

C.大脑后动脉

D.椎-基底动脉

E.大脑中动脉
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单项选择题

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is（）. It determines how the various results are computed by the product and presents this information in the form of a（） . and associated scenarios. The second is （）, which determines the classes and their attributes; Then determine the interrelationships and interaction among the classes. The last step is （）, which determines the actions performed by or to each class or subclass and presents this information in the form of（） .

The first step is（）.

A.use-case modeling

B.class modeling

C.dynamic modeling

D.behavioral modeling
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