There is going to _____ a talk in the au_爱下问搜题

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问题选择题

There is going to _____ a talk in the auditorium.

A. has
B. have
C. be
D. take

答案

答案：C

选择题

下列物质中的氮元素只能体现氧化性的是（　　）

A．NH₃

B．NO

C．NO₂

D．HNO₃

解答题

先化简再求值：求x-2(x-

y2)+(2x-2y2)的值，其中x=3，y=-2．