题目:
I just don"t understand _____ that leads to so many teenagers becoming addicted to playing computer games. [ ]
A. why it does
B. what it is
C. what it does
D. why it is
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:W、X是金属元素,W、X的最高价氧化物对应的水化物应为碱,可以相互反应,说明一种为两性氧化物,应为Al(OH)3,则W为Na,X为Al,Y的最外层电子数是核外电子层数的2倍,且与Na、Al在同一周期,...