下列各组词语中，有两个错别字的一组是[ ] A．寒暄 悚然 踌躇 走头无路 B．

H₂S是无色有（）味的气体，

阅读理解。

     Do you get enough sleep? With so much homework it's often difficult to get the rest you need. But you

need to try, because sleep keeps you healthy and it stops you getting fat. Recently, a group of U. S. scientists

did a study (研究) of kids aged between 8 and 13. The study found that if kids sleep for just one extra

(额外的) hour each day, the chance of their getting fat is cut by about 30 percent.

     Why? When people don't get enough sleep, they become tired. When they are tired, they don't exercise

enough. Also, kids like snacks. If they are awake (醒着的) an extra hour or two each day, they have more

time to eat snacks or other unhealthy foods.

     So, how much sleep should you get? Scientists suggest 10 to 11 hours a night for kids aged 5 to 12. For

older kids, eight to nine hours will do.

1. How many reasons are given why people might get fat without enough sleep?

A. 3.

B. 2.

C. l.

D. None.

2. If you are under 10, how long do the scientists advise you to sleep?

A. 10 to 11 hours.

B. 8 to 9 hours.

C. 8 to 13 hours.

D. As long as possible.

3. Where was the study done by the scientists?

A. In China.

B. In Britain.

C. In America.

D. In Japan.

4. What does "eight to nine hours will do" mean? 

A. Eight to nine hours' sleep will be good and enough.

B. Eight to nine hours' sleep will be too long.

C. Eight to nine hours' sleep will help get fat.

D. Eight to nine hours' sleep will help eat snacks and unhealthy foods.

5. What does the passage talk about?

A. How to get long sleep.

B. How to keep fat.

C. Enough sleep makes people healthy and slim (苗条).

D. Long sleep makes people healthy and slim.

右图是某学校实验室从化学试剂商店买回的浓硫酸试剂标签上的部分内容。

现用该浓硫酸配制100 mL 1 mol·Ｌ^－1的稀硫酸。

可供选用的仪器有：①胶头滴管；②烧瓶；③烧杯；④ 药匙；⑤量筒；⑥托盘天平。

请回答下列问题：

(1)盛放浓硫酸的试剂瓶标签上应印有下列警示标记中的       

(2)配制稀硫酸时，还缺少的仪器有                               (写仪器名称)；

(3)经计算，配制100 mL1 mol·Ｌ^－1的稀硫酸需要用量筒量取上述浓硫酸的体积为   mL，量取硫酸时应选用    mL规格的量筒；

A．10 mL    B．50 mL     C．100 mL    D．200mL

(4)在烧杯中稀释浓硫酸的实验操作为                                             

若在稀释过程中，少量浓硫酸不慎沾在手上，处理方法为                                                      

(5)对所配制的稀硫酸进行测定，发现其浓度大于1 mol·Ｌ^－1，配制过程中下列各项操作可能引起该误差的原因                                  。

A．用量筒量取浓硫酸时，仰视刻度线取浓硫酸             

B．容量瓶用蒸馏水洗涤后未干燥，含有少量蒸馏水

C．将稀释后的稀硫酸立即转入容量瓶后，紧接着就进行以后的实验操作

D．转移溶液时，不慎有少量溶液洒到容量瓶外面

E．定容时，俯视容量瓶刻度线进行定容

F．定容后，把容量瓶倒置摇匀后发现液面低于刻度线，便补充几滴水至刻度处

作业控制方式有两种，它们是()。

A．批处理与实时

B．交互与实时

C．批量型与终端型

D．脱机控制与联机控制

委托处置行按照（）的顺序收本收息。

A.先收委托处置资产表内应收利息，再收委托处置资产本金，最后收委托处置资产表外应收利息

B.先收委托处置资产本金，再收委托处置资产表内应收利息，最后收委托处置资产表外应收利息

C.先收委托处置资产表内应收利息，再收委托处置资产表外应收利息，最后收委托处置资产本金

D.先收委托处置资产表外应收利息，再收委托处置资产本金，最后收委托处置资产本金