问题 填空题

将一定量的炉甘石(ZnCO3)和赤铜矿(Cu2O)粉末跟足量炭粉混合,加热至800℃左右,充分反应后可得到一种外观类似黄金的合金。同学们对这种合金的成分很感兴趣,查阅资料:高温时木炭可将金属活动性顺序中铝以后金属的氧化物还原成金属单质;在高温条件下,ZnCO3可分解成金属氧化物和一种常见气体。

(1)写出ZnCO3分解反应的化学方程式 ___________。

(2)以下是同学们对该合金成分的几种猜想: a.可能是Zn、Cu b.可能是Zn、Cu、C c.可能是ZnO、CuO、Cu 如果想证明a中Zn的存在,可选用的试剂是____,反应的化学方程式为____。

(3)你认为几种猜想中应首先排除的是____(填“a”“b”或“c”),理由是____。

答案

( 1 ) ZnCO3ZnO +CO2

(2)盐酸(HCl溶液);Zn +2HCl ==ZnCl2+ H2 ↑(合理答案均可)

(3)c  ;高温时木炭可将ZnO、CuO还原成单质

阅读理解

Held on the second Wednesday of March each year, No Smoking Day helps people across the UK who want to stop smoking. The activity encourages and helps smokers to give up, and publicizes(宣传) the many sources of help offered to people. Each year over a million smokers take part in the day, while about 40,000 actually give up smoking.

The much-publicized effects of smoking include increased risk (风险) of heart disease, lung cancer and asthma. However, smoking also causes dull skin and wrinkles. The reducedamount of oxygen getting to the skin accelerates (加速)aging, and makes the skin look sallow (病黄色的). And while many smokers believe that cigarettes help them to cope with stress (对付压力), scientific research has shown that worry levels actually go down after giving up smoking.

Set a date and time to stop, and keep to it .Talk to your doctor about whether any kind of medicines might suit you.

Find out if there is a stop-smoking health center near you .Try to get the help of your friends and family.

Keep away from situation in which you used to reach for cigarette. If you need to, use nicotine patches (尼古丁戒烟贴片) or gum.

NHS Stop-smoking Centers are all over the UK, providing free services. They have specially trained employees who can advise you on the best way to stop smoking. There are also a number of free national helpline in England, Scotland, Wales, and Northern Ireland, where expert counselors can discuss with you how to give up smoking step by step.

小题1:How many people don’t give up smoking among those who take part in No Smoking Day every year according to the passage?

A.About 1,000,000.

B.About 40,000.

C.About 960,000.

D.About 1,040,000.小题2:According to the passage, place the following titles in the correct orders.

A.What are the health risks of smoking?

B.A few tips on giving up smoking:

C.What is No Smoking Day?

D.What help is offered for giving up smoking?

A. a; b; c; d      B. b; a; d; c       C. d; a; b; c       D. c; a; b; d

小题3:Which of the following is Not true according to the passage?

A.No Smoking Day is held on the second Wednesday on March.

B.Smoking can make skin look dull.

C.If you give up smoking, your worry levels will increase.

D.You can get treatment in NHS Stop-smoking Centers for free.小题4:The underline word “counselors” in the last paragraph probably means _______.

A.nurses

B.advisers

C.employees

D.doctors小题5: How many tips on giving up smoking are mentioned in the passage?

A.Three

B.Four

C.Five

D.Six

单项选择题