题目:
After having some interesting rides and terrifying free-fall drops, the children returned home,
_________ but excited.
A.inspired
B.satisfied
C.worn-out
D.depressed
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Si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)×2+x+(-2)×3=0,则x=+4.故选B.