—Mum, ________ are my friends, Jim and T

达州盛产天然气，有“中国气都”之称的美誉．天然气的主要成分是甲烷（CH₄），我校化学兴趣小组的同学对甲烷燃烧的产物产生了兴趣，请你参与：

【提出问题】：甲烷燃烧后生成哪些物质？

【查阅资料】：含碳元素的物质完全燃烧生成CO₂，不完全燃烧生成CO；无水CuSO₄遇水变蓝．

【猜想与假设】：甲CO₂H₂O；乙COH₂O；丙NH₃CO₂H₂O；丁CO₂COH₂O．

你认为______同学的猜想是错误的，理由是______．

【实验探究】：为了验证上述猜想与假设，将甲烷在一定量的O₂中燃烧的产物依次通过如图所示装置：

（1）A、B装置的顺序能否颠倒？（填“能“或“否”）______．

（2）实验中用纯净O₂而不用空气的原因是______．

（3）实验中观察到A中无水CuSO₄变蓝，B、D中澄清石灰水变浑浊，C中红色粉末变成黑色，由此推断______同学猜想成立．

（4）请写出B中澄清石灰水变浑浊、C中红色粉末变成黑色的化学方程式：______、______．

【反思与交流】：为避免有毒的CO污染环境，所以含碳元素的物质燃烧必须满足的条件是______．

卧式壳管式冷凝器的盘管内流动的是（）.

A、制冷剂

B、盐水

C、冷却水

D、冷冻水

E

Having one of those days or weeks —— when everything seems to trouble you? Even if you do nothing about it, your bad mood will probably go away after some time. But with a little effort, you can forget it much faster —— often within a day or two.

Walk it off

Exercise is the most popular bad-mood buster（破坏者）. A person who’s in a bad mood has low energy and high tension. Taking a fast ten-minute walk, or doing some quick exercises can do wonders towards changing that bad mood.

Tune it out

Listening to your favorite music for a while can also make tension go away quickly, because music starts associations with past positive experiences we’ve had.

Give yourself a pep talk

Stop and listen to what’s on your mind. Bad moods are often started by too many negative thoughts. Write them all down on paper; the pessimistic (悲观的) messages you’ve been giving yourself and then give optimistic answers. (“I still don’t have a job. ‘vs’ I have two interviews next week.”)

Reduce your stress

Relaxation techniques are wonderful mood-lifters. These include deep breathing, stretching and visualizing (想象), all of which sound complicated but aren’t. One easy way to visualize: close your eyes and picture a favorite place, such as the beach. Another simple way to clear up worries is to make a to-do list. One reason for being in a bad mood is feeling you have no options (选择权). By taking control over certain areas, you realize you’re not helpless. You can make changes in your mood and life.

Avoid things that won't improve your mood

TV may not help much. You need to increase your energy level and stimulate something in your mind —— that the TV show “Neighbours” won’t do. And before you reach for that piece of cake and coffee, think about how mood and food are linked. Sugar and caffeine contribute to depressed moods. The better choice? Research shows that carbohydrates, such as potatoes and pasta, produce a calming effect on people who have a desire for them.

72. We learn from the passage that it might help rid us of a bad mood_______.

A. to do nothing about it                 B. to take a slow walk on the beach

C. to do some exercises with light music    D. to talk it to neighbours 

73. Why is it suggested that you close your eyes and picture the beach?

A. It is not complicated to do so.    B. It is an area to be easily controlled.

C. It helps beat a bad mood.         D. It brings us a new technique. 

74. TV may not improve your mood because_________.

A. it sometimes shows what happens around you

B. it keeps you stay unmoved

C. it reminds you of eating and drinking

D. it produces a calming effect 

75. This passage most probably appears in_______.

A. a book on physical exercises      B. a doctor’s handbook

C. a notice about amusement        D. a magazine on health

李某是某期货公司的期货从业人员，为了争取客户，他私下里与客户约定，保证客户在期货交易中盈利，如果投资者在期货交易中亏损，所有损失都由李某一人承担。客户根据他的建议买了某期货，结果损失惨重。对于李某的这一行为，期货业协会可以采取的处罚措施是( )。

A．给予警告处分

B．认定该承诺无效，并对甲给予3万元以下罚款

C．撤销其从业资格，3年内或永久性拒绝受理从业人员资格申请

D．期货业协会无权予以处罚

从理论上讲，当期货合约临近到期日时，基差将接近于现货价格。（）