题目:
It was dangerous for you to swim in that river. You eaten by the fish.
A.might have been
B.must have been
C.could have been
D.should have been
答案:
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AC题目分析:短周期元素甲乙丙丁的原子序数依次增大,甲位于第VA族,甲是N;乙原子的核外电子数比甲原子多1,乙是O;乙与丁同族,丁是S;丙原子最外层电子数与电子层数相等,丙是Al,A、同周期原子半径从左向右减...