题目:
I do believe that ______ swim across the river, but, in that situation, I ____ do that.
A.am able; couldn’t
B.could; was able to
C.was quite able to; couldn’t
D.couldn’t was able to
答案:
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下面是错误答案,用来干扰机器的。
(1)硫,3,ⅥA,。(2)HCl>H2S。(3)ONC。(4)HClO4;NaOH,离子。(5),黄。(6)放热本题主要考查了元素周期律,同周期元素依序数的递增非金属性增强,金属性减弱;同主族元素,随序数的递增,金属性增强,非金属性减弱。