普通三角螺纹牙深与（）相关。A、螺纹外径  B、螺距  C、螺纹外径和螺距  D、与

为实现思想上的大一统，保证皇帝权威和朝廷政令推行，董仲舒向汉武帝建议（  ）

A．“焚书坑儒”

B．“罢黜百家，独尊儒术”

C．创立科举制

D．大兴文字狱

     There are countless diet programs and weight loss systems available. The majority are from multi-

million dollar companies. Do you really think these businesses achieved success with a one-time, fix-all

diet plan? No, they count on having most people return on a recurring basis; hence the term "yo-yo

dieting". A lot of diet plans can be very limiting. You are required to follow a certain meal plan, which

may consist of certain foods. Some plans are more exact and restrictive than others. Some diet companies even supply you with the actual meals. This means even more revenue(收入) for these businesses.

     A well-balanced diet consists of carbohydrates that are low in sugar (they're sometimes referred to as "good carbs"), proteins, and fats. (Yes, fats are important, too.) Fortunately for you, a well-balanced diet

is all that is needed to safely and effectively lose or maintain weight, depending upon your goals.

     By educating yourself and having the willpower and commitment to make the proper food choices,

you'll be well on your way toward achieving your weight-loss goals. After all, in order for a diet to be

really successful, it cannot be just a diet. You must develop and conform to(遵守) a lifestyle that revolves around smart food decisions. This doesn't mean that you can never enjoy certain things that you crave(渴望), at least from time to time. We can all enjoy such things, but moderation is the key. A week's worth of smart choices deserves a meal out at your favorite restaurant. It also gives you something to look forward

to and enjoy when you are saying "no" to those office donuts all week long.

     Don't get me wrong. It isn't always going to be easy. But rarely does anything worth having come

easily. Liking what you see in the mirror, and being fit and healthy are definitely worth working hard for.

Anyone can achieve such goals. To break out the old Nike phrase —Just Do It.

1. The first paragraph mainly tells us ____________.

A. there're many kinds of diet plans or programs with different effects

B. why so many diet plans can not help people to control weight

C. the diet plans do not work and can only benefit the companies

D. people can't stick to the diet plans because they are dull

2. If you want to control weight safely and effectively, what you do NOT need is ____________.

A. the diet plans from the big company      

B. a well-balanced diet

C. the willpower and determination

D. a lifestyle considering smart food choices

3. What's the correct understanding of the underlined sentence?

A. Once you have a big meal in the restaurant, your week's effort will be in vain.

B. If you can make smart food choices for a week, you can treat yourself to a favourite meal out.

C. A week's smart food choices itself, not a meal out, is a big reward for you.

D. A week's proper food at home is as attractive as a delicious meal outside.

4. What's the correct attitude towards the food you like?

A. Have some whenever you like.            

B. Eat much after a diet of a long time.

C. Enjoy it once in a while but never too much.

D. Never have it before you successfully lose weight.

5.  The last paragraph is meant to ____________.  

A. conclude what's the best way to control weight  

B. emphasize the reasons why people should diet  

C. predict the results of taking well-balanced food

D. encourage people to take action in spite of difficulties

作物在具体生产条件下所能形成的产量称为（）。

餐车电磁炉由哪几部分组成？

定置管理的任务是为了实现（）三者达到最佳的结合状态，实现安全、优质、高效的生产目的。

A.人、物、场所

B.人、材、成本

C.人、材、机

D.人、材、质量