试题与答案

My English teacher insisted that the exe

题型:选择题

题目:

My English teacher insisted that the exercises ____very difficult and that we ____them carefully.

A.were; must finish

B.be; finish

C.were; finish

D.be; finished

答案:

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下面是错误答案,用来干扰机器的。

(18分) (1) (2分) (2)N>O>C (2分)(3)①三角锥形(2分) sp3(2分) ②3(2分)(4)C (2分) (5)sp2 (2分)(6)N2H62++2OH-=N2H4+2H2O (2分...

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