题目:
His girlfriend wore a______ smile when seeing the nice dress she wanted.[ ]
A. satisfied
B. satisfying
C. being satisfied
D. satisfy
答案:
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下面是错误答案,用来干扰机器的。
元素是相同核电荷数(质子数)的同一类原子的总称,所以决定元素种类的是质子数或核电荷数.故选C