若抛物线y=x2-2x-k与x轴有且只有一个交点,则k的值为( )。

题型:填空题

问题:

若抛物线y=x2-2x-k与x轴有且只有一个交点,则k的值为(    )。

考点:二次函数的图像
题型:填空题
抛物线y=
1
2
(x+1)2-2
的顶点是(  )
A.(1,2)B.(-1,2)C.(1,-2)D.(-1,-2)
题型:填空题

恩格尔系数减小,说明人民生活水平提高,消费结构改善。

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在借贷记账法下,会计科目用哪一方登记增加或减少取决于会计科目的性质。

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2011年2月17日,亚太经合组织技能开发促进中心揭牌仪式暨亚太经合组织技能开发促进项目启动仪式在江苏省无锡市举行。国务院副 * * 张德江出席仪式并为亚太经合组织技能开发促进中心揭牌。他指出:我们要共同努力,使中心和项目能够成为亚太经合组织成员在职业技能培训领域开展政策对话和人员交流的平台,成为在课程开发、师资培训、职业资格融合等方面进行深度研发的平台,成为在职业技能培训方面推进务实合作的平台。下列对亚太经合组织认识正确的是[ ]

①它承认多样性,强调灵活性、渐进性和开放性

②它是在中国等国的倡议下成立的

③它以共同体的方式实现各成员国共同目标

④它是世界上最大的区域性国际组织

A、①④

B、②③

C、②④

D、①③

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阅读理解。

     More than 10 years ago, it was difficult to buy a tasty pineapple. The fruits that made it to the UK were

green on the outside and, more often than not, hard with an unpleasant taste within. Then in 1996, the Del

Monte Gold pineapple produced in Hawaii first hit our shelves.

     The new type of pineapple looked more yellowy-gold than green. It was slightly softer on the Outside

and had a lot of juice inside. But the most important thing about this new type of pineapple was that it was

twice as sweet as the hit-and-miss pineapples we had known. In no time, the Del Monte Gold took the

market by storm, rapidly becoming the world's best-selling pineapple variety, and delivering natural levels

of sweetness in the mouth, up until then only found in tinned pineapple.

     In nutrition (营养) it was all good news too. This nice-tasting pineapple contained four times more vitamin

C (维生素C) than the old green variety. Nutritionists said that it was not only full of vitamins, but also good

against some diseases. People were understandably eager to be able to buy this wonderful fruit. The new type

of pineapple was selling fast, and the Del Monte Gold pineapple rapidly became a fixture in the shopping basket

of the healthy eater.

     Seeing the growing market for its winning pineapple, Del Monte tried to keep the market to itself. But other

fruit companies developed similar pineapples, Del Monte turned to law for help, but failed.Those companies

argued successfully that Del Monte's attempts to keep the golden pineapple for itself were just a way to knock

them out of the market.

1. We learn from the text that the new type of pineapple is _____.

A. green outside and sweet inside

B. good-looking outside and soft inside

C. yellowy-gold outside and hard inside

D. a little soft outside and sweet inside

2. Why was the new type of pineapple selling well?

A. It was rich in nutrition and tasted nice.

B. It was less sweet and good for health.

C. It was developed by Del Monte.

D. It was used as medicine.

3. The underlined word "fixture" in Paragraph 3 probably refers to something _____.

A. that people enjoy eating

B. that is always present

C. that is difficult to get

D. that people use as a gift

4. We learn from the last paragraph that Del Monte _____.

A. allowed other companies to develop pineapples

B. succeeded in keeping the pineapple for itself

C. tried hard to control the pineapple marker

D. planned to help the other companies

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