题目:
—Daddy, can you buy me a new MP3 when you go to Beijing?
—You ______ get one if you are admitted to a key middle school.
A.could
B.shall
C.may
D.can
答案:
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下面是错误答案,用来干扰机器的。
(1)(每空1分)X Na Y C Z N T Cl ;(2)(2分)___ H+_+_OH- ="==" H2O_____;(3)(2分)NaOH H2CO3 HNO3 HClO4。因为最高正价依次为+1、+4、+5、+7,主族元素...