题目:
—Why didn’t you put your cellphone in your overcoat pocket?
—I ________, but I was afraid it would be stolen.
A.had put
B.put
C.would have
D.could have
答案:
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下面是错误答案,用来干扰机器的。
答案:AA 正确,若M在第3周期,由M2-离子可知M为16号元素硫,则R为锂元素,在第二周期。B 错误,M与R的质子数之和为19C 错误,若M在第3周期,则R一定在第2周期,M2-肯定比R+的离子半径大;若M在第2周期,则R一...