试题与答案

9月中旬,湘中地区一般进入秋季(如果连续10天日平均气温低于22℃,则被认为进入

题型:选择题

题目:

9月中旬,湘中地区一般进入秋季(如果连续10天日平均气温低于22℃,则被认为进入秋季)。读长沙2008年9月中下旬的天气状况表,回答下列各题。

日期15日16日17日18日19日20日21日22日23日24日
最低气温23℃23℃24℃25℃26℃27℃28℃28℃28℃25℃
最高气温31℃32℃33℃34℃35℃36℃37℃38℃38℃30℃
天气多云
风力较强偏北风
小题1:2008年9月15--23日,长沙日温差的大致变化规律及影响因素分别是(   )

A.日温差降低,天气状况

B.日温差增大,地面状况

C.日温差增大,风力状况

D.日温差增大,天气状况小题2:与往年相比,长沙在该期间天气异常的主要原因可能是(   )

A.夏季风强劲,晴热少雨

B.“副高”异常强大并控制该地

C.直射点北移,太阳辐射加强

D.亚洲高压异常强盛小题3:2008年9月24日长沙地区            (   )

A.气温变化与风向、风力无关

B.大气的保温作用和削弱作用增强

C.开始进入秋季

D.阴晴变化与“副高”北移

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:解析 根据题意,设每台机器工作效率为“1”,原共有机器x台。增加2台时,共用工作时间20-10=10小时;增加8台时,共用工作时间16-10=6小时。根据牛吃草原理根据,可列方程:(x+2)10=(x+8)8,解...

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Trying to get Americans to eat a healthy diet is a frustrating business. Even the best- designed public-health campaigns cannot seem to compete with the tempting flavors of the snack-food and fast-food industries and their fat-and sugar-laden products. The results are apparent on a walk down any American street--more than 60% of Americans are overweight, and a full quarter of them are overweight to the point of obesity.

Now, health advocates say, an ill-conceived redesign has taken one of the more successful public-health campaigns--the Food Guide Pyramid--and rendered it confusing to the point of uselessness. Some of these critics worry that America’ s Department of Agriculture caved in to pressure from parts of the food industry anxious to protect their products.

The Food Guide Pyramid was a graphic which emphasizes that a healthy diet is built on a base of grains, vegetables and fruits, followed by ever-decreasing amounts of dairy products, meat, sweets and oils. The agriculture department launched the pyramid in 1992 to replace its previous program, which was centered on the idea of four basic food groups. The" Basic Four" campaign showed a plate divided into quarters, and seemed to imply that meat and dairy products should make up half of a healthy diet, with grains ,fruits and vegetables making up the other half. It was replaced only over the strenuous objections of the meat and dairy industries.

The old pyramid was undoubtedly imperfect. It failed to distinguish between a doughnut and a whole-grain roll, or a hamburger and a skinless chicken breast, and it did not make clear exactly how much of each foodstuff to eat. It did, however, manage to convey the basic idea of proper proportions in an easily understandable way. The new pyramid, called" My Pyramid", abandons the effort to provide this information. Instead, it has been simplified to a mere logo. The food groups are replaced with unlabelled, multi-colored vertical stripes which, in some versions, rise out of a cartoon jumble of foods that look like the aftermath of a riot at a grocery store. Anyone who wants to see how this translates into a healthy diet is invited to go to a website, put in their age, sex and activity level, and get a custom-designed pyramid, complete with healthy food choices and suggested portion sizes. This is fine for those who are motivated, but might prove too much effort for those who most need such information.

Admittedly, the designers of the new pyramid had a tough job to do. They were supposed to condense the advice in the 84-page United States’ Dietary Guidelines into a simple, meaningful graphic suitable for printing on the back of a cereal box. And they had to do this in the face of pressure from dozens of special interest groups--from the country’ s Potato Board, which thought potatoes would look nice in the picture, to the Mmond Board of California, which felt the same way about almonds. Even the National Watermelon Promotion Board and the California Avocado Commission were eager to see their products recognized.

Nevertheless ,many health advocates believe the new graphic is a missed opportunity. Mthough officials insist industry pressure had nothing to do with the eventual design, some critics suspect that political influence was at work. On the other hand, it is not clear how much good even the best graphic could do. Surveys found that 80% of Americans recognized the old Food Guide Pyramid--a big success in the world of public-health campaigns. Yet only 16% followed its advice.

The phrase "caved in" ( paragraph 2) most probably means()

A. yielded

B.entered

C. promised

D. criticized

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