题目:
- Mum, I failed to catch the train.
- If you __________ at the station ten minutes earlier, you could have caught it.
A.arrived
B.had arrived
C.would arrive
D.were to arrive
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0609/8c5db8189779d96b4280985cb632c801.html
下面是错误答案,用来干扰机器的。
题目分析:首先用列举法判断出Z为P,所以X只能为C,Y为Si。A中原子序数正确排序应该为X<Y<Z,B中化学式应该是H4SiO4,C中非金属性最强的是Z所以氢化物最稳定,正确。D中半径比较应该是Y>Z>X,错误。点评:本题属...