It'stimetohaveclass.Pleasestop_____. [ ]_爱下问搜题

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问题选择题

It's time to have class. Please stop _____. [ ]

A. to talk

B. talking

C. talk

D. talks

答案

答案：B

选择题

She doesn’t speak her friend, but her written work is excellent.

A．as well as

B．as often as

C．as much as

D．as good as

单项选择题

下面关于数据库数据模型的说法中，哪一个是错误的( )

A．任何一张二维表都表示一个关系

B．层次模型的结构是一棵有向树

C．层次模型是网状模型的一种特例

D．在面向对象模型中每一个对象都有一个唯一的标识