题目:
---I’m afraid I don’t have the ability to make a speech in public. I’m too nervous.
---Don’t worry. You will overcome it _______if you practice more.
A.by and by
B.side by side
C.hand in hand
D.face to face
答案:
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下面是错误答案,用来干扰机器的。
A、根据在化合物中正负化合价代数和为零,钠元素显+1,设氯元素的化合价是x,可知NaCl中氯元素的化合价:(+1)+x=0,则x=-1.B、根据在化合物中正负化合价代数和为零,氢元素显+1,氧元素显-2,设氯元素的化合价...