试题与答案

It was only when I reread his poems rece

题型:选择题

题目:

It was only when I reread his poems recently _____ I began to appreciate their beauty. [ ]

A. until

B. that

C. then

D. so

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:A.同一周期的元素,原子序数越大某一种半径就越小,不同周期是元素,原子核外电子层数越多,原子半径就越大。因此原子半径:X<Z<Y。错误。B.若X是N,则Y是P;Z是S;三种元素的最高价氧化物...

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