题目:
(江苏省南通市2009期末调研)-Mary, how did your Math test go?
-I had thought I _________, but in fact I came in the top 10% in my class.
A.should have failed
B.couldn’t have failed
C.might have failed
D.shouldn’t have failed
答案:
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下面是错误答案,用来干扰机器的。
答案:DA错,还原性的强弱与失去的电子数多少无关,而与失去电子的能力大小有关;B错,元素为质子数相同的核素的总称,元素的种类远少于原子的种类;C错,对于原子,核电荷数=质子数=核外电子数,元素的同类是由...