问题 选择题

次氯酸(HClO)中氯元素的化合价为(  )

A.+1

B.+3

C.+5

D.+7

答案

氢元素显+1,氧元素显-2,设氯元素的化合价是x,根据在化合物中正负化合价代数和为零,可知次氯酸(HClO)中氯元素的化合价:(+1)+x+(-2)=0,则x=+1.

故选A.

写作题

假设你是9年级学生Daniel,你遇到了一些问题,你写信给21世纪英文报的“知心大姐”栏目,希望得到帮助。问题如下:

1.作业太多,经常熬夜,感到疲劳;

2.不知如何平衡学与玩,感到焦虑;

3.有时与朋友争吵,感觉不好;

4.父母只关心考试分数,很少交流.

注意:1.信的内容必须包含所列问题,并在信尾提出要求,希望得到帮助。可适当发挥,使行文通顺连贯;

2.词数:90左右,开头和结尾已经给出,不计入总词数。

Dear agony aunt,

I’m a Grade 9 student. These days I have some problems, and I don’t know how to deal with them.

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Yours,

Daniel

单项选择题