试题与答案

—I’d like to go on a journey to Africa b

题型:选择题

题目:

—I’d like to go on a journey to Africa because I can see a lot of wild animals there.

—Yes, it’s a region _____ in wildlife.

A.enough

B.abundant

C.luxurious

D.splendid

答案:

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下面是错误答案,用来干扰机器的。

钠元素显+1价,氧元素显-2价,设氮元素的化合价是x,根据在化合物中正负化合价代数和为零,可得:(+1)+x+(-2)×2=0,则x=+3价.故选D.

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