某硫酸铝溶液密度为1.28g-cm-3，其中铝离子的质量分数为5.3%，200m

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问题选择题

某硫酸铝溶液密度为1.28g-cm^-3，其中铝离子的质量分数为5.3%，200mL该溶液中SO₄^2-离子的物质的量约等于（　　）

A．0.21mol

B．0.35mol

C．0.5mol

D．0.75mol

答案

答案：D

填空题

词汇。

1. — How much is the handbag?

— It's 920 dollars.

— Oh, it's too e_______.

2. The doctor told the patient how to keep h_______.

3. I like ball games very much, but my f_______ sport is playing basketball.

4. It's snowing h_______. You must drive carefully.

5. Eating more v_______ and fruit is good for your body.

6. Do you know the teacher with thick g______? She reads too much everyday.

7. — Who's teaching skating?

— Nobody. We're learning it o______.

8. Is there anything to drink? I'm very t_______.

9. The boy wrote so c _______ that he didn't notice it begin to rain.

10. M_______: spoken or written piece of information passed from one person to another.

计算题

（1）0.5+1.3=	（2）12.3+3.4=
（3）1.4+0.2=	（4）3.1+1.8=