下列物质中不属于烃的衍生物的是 A．链式炔碳 B．尿素CO (NH2)2 C．四

阅读理解。

    Never go into a supermarket hungry! This is a good piece of advice. If you go shopping for food before

lunchtime, you'll probably buy more than you plan to. Unfortunately, however, just this advice isn't enough

for consumers these days. Modern shoppers need an education in how and how not to but things at the

store. First, you check the weekly newspaper ads. Find out the items that are on sale and decide if you really

need these things. In other words, don't but anything just because it's cheaper than usual! "New and

Improved!" or "All Natural" on the front of a package influence you. Instead, read the list of ingredients

(成分) on the back. Third, compare prices: that is, you should examine the prices of both different brands

and different sizes of the same brand.

    Another suggestion for customers is to buy ordinary items instead of famous brands. Ordinary items in

supermarkets come in plain packages. These products are cheaper because producers don't spend much

money on packing or advertising. The quality, however, is usually as good as the quality of well-known

name brands. In the same way, in buying clothes, you often find high quality and low pices in brands that

are not famous. Shopping on discount clothing stores can help you save a lot of money. Although these

stores aren't very attractive, and they usually do not have individual dressing rooms, not only are the prices

low, but you can often find the same famous brands that you find in high-priced department stores. 

    Wise consumers read magazine ads and watch TV commercials, but they do this with one advantage:

knowledge of the psychology behind the ads. In other words, well-informed consumers watch for information

and heck for misinformation. They ask themselves questions: Is the advertiser hiding something in small print

at the bottom of the page? Is there any real information in the commercial, or is the advertiser simply showing

an attractive image? With the answers to these questions, consumers can make a wise choice.

1. Before you decide to buy things you should ____. [ ]

A. make sure whether they are on sale

B. consider if you really need them

C. examine the prices of different brands

D. read the words on the front of the package

2. The writer suggests consumers buy ordinary products because ____. [ ]

A. they come in plain package

B. they are advertised on newspapers

C. they are both good and cheaper

D. the quality is better than that of famous ones

3. The main idea of the last paragraph is that ____.[ ]

A. ads and commercials sometimes tell lies

B. advertisements sometime hide some information

C. good consumers never read ads and commercials

D. we should make good use of ads and commercials

看图，完成对话

1.

A: Let's play ping-pong.

B: No, I __________ have a  ping-pong ball.

2.

A: __________ play tennis.

B: But I don't __________ a tennis.

3.

A: Well, let's play __________.

B: That sounds __________.

某排水公司项目部承建的lkm雨水管线改造工程，采用φ400双壁波纹管，管道基础为砂垫层，设计支承角为1800。改建后的管底高程为地表以下3m。基层以下地层为湿度小的黏性土。工程施工部位路面宽8米，要求施工期间不得中断交通，采用设置土壁支撑方法施工

沟槽回填时不正确的施工方法是()。

A.沟槽回填从管底基础部位开始到管顶以上0.7m范围内，必须人工回填，严禁用机械推土回填

B.回填前应排除沟槽积水，不得回填淤泥，有机物及冻土

C.回填土的含水量，应按回填材料和采用的压实工具控制在最佳含水量附近

D.为减少土方倒运，闭水试验合格段先回填至管顶部位，待另一段开挖时再回填管顶以上部位

关于米古利兹病的说法，错误的是（）

A.非独立的疾病，而是多种疾病的共同表现

B.可能与机体免疫缺陷有关

C.唾液腺和腮腺肿大，可伴有淋巴结及肝、脾肿大

D.单侧无痛性泪腺肿大

E.组织改变有淋巴细胞浸润、导管上皮和肌上皮增生

主性征与副性征