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.