MHCⅠ类分子的配体是() A.CD4 B.CD8 C.CD28 D.Cadheri

题型:单项选择题

问题:

MHCⅠ类分子的配体是()

A.CD4

B.CD8

C.CD28

D.Cadherin

E.L-选择素

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法国大革命在较短的时间内改造了法国社会,其原因和条件包括(   ) 

①社会矛盾激化,改革时机较为成熟 ②资产阶级和人民群众结盟,改造具有强大的推动力

③启蒙思想家提供了改造的政治方案 ④英、美资产阶级革命提供了成功的经验

A、①②③

B、②③④

C、①②③④

D、①③④

题型:单项选择题

矿井完好的矿灯总数,至少应比经常用灯的总人数多(),矿灯房应用不燃性材料建筑。

题型:单项选择题

化学就在我们身边,它能改善我们的生活。根据所学知识回答:

(1)某工地发生多人食物中毒,经化验为误食工业用盐亚硝酸钠(NaNO2)所致,亚硝酸钠(NaNO2)中氮元素的化合价是_________。

(2)一物质X在空气中燃烧的化学式方程式为X+3O2 点燃 2CO2+3H2OH,则X的化学式为__________。

题型:单项选择题

古人云“吾生有崖,而知无涯”,其意对现代从业人员的启示是()。

A.生命短暂,不要想入非非

B.树立终身学习的理念

C.知足常乐,和谐为本

D.知识可以改变命运

题型:单项选择题

The First of May is a Bank Holiday—the first public holiday of the year in England. Most people consider it a special day, the beginning of summer, a day when the light lasts long into the evening, and when we can look for warm weather. We don't always get it. We feel disappointed, but not surprised if there are cold winds and frosts at night in May. Winter should be over. Most people know that in the past, when farming occupied almost everyone, the changing seasons were of great importance. In that older time there was every reason to celebrate May Day. Customs of those celebrations remain.

Of these customs, the best known is the choosing of a May Queen and the dancing round Maypole. Even these customs are little more than memories now—but in the last century it was quite common in villages and small towns, and even in schools and colleges, for a pretty and popular girl to be chosen Queen of the May. It was a great honour to be chosen. For a day she wore a light and flowery dress, carried garlands(花环), and was ceremonially crowned with flowers. She presided over a procession, as a rule with a number of attendants, and over the Maypole dancing and all kinds of entertainment. The Maypole was slender(苗条的.&) tree trunk, cut off its branches, with beautiful ribbons fastened to the top. The dancing was designed in such a way that the dancer's movements move the ribbons into a pattern. This, as you can imagine, required skill from the dancer, and was not achieved without practice.

It's the Celtic people who celebrated the First of May as a spring festival. Their celebration seems to have had little to do with taking pleasure in early, beautiful flowers and in warmer weather! They called it Beltane—the fire of the god Bel. They lit fires, in the expectation that their blaze would help the sun in its struggle to regain its strength. They drove their cattle between banks of flame in the expectation that the terrified beasts would be purified and protected from disease. A tree, which must have been blackened with smoke, stood in the middle of the fires, and is thought to have been the origin of the Maypole. Their priests(牧师) made sacrifices to the goods in the hope of good harvests and sufficient store of food for the winter. There was dancing certainly, but it was noisy and cheerful, since its purpose was not to weave a pattern of colored ribbons, but to drive out evil spirits from the earth and to arouse those kind spirits.

57. The main purpose of the passage is to show ________.

A. the reason why they celebrate May Day

B. the start and customs of May Day

C. the way they celebrate May Day

D. the choosing of a May Queen during May Day

58. According to the passage, which sentence is NOT true?

A. In the old days they celebrated May Day for the changing of the seasons.

B. In England summer begins at the first of May.

C. The custom of the choosing of a May Queen still exists in the present May Day celebration.D. The Celtic people celebrated the first of May as a spring festival.

59. From the surrounding words and sentences we know that the word “presided” means ____.

A. 管理    B. 越过   C. 指挥   D. 主持

60. The best title for this passage is ________.

A. The First of May     B. The Beginning of Summer

C. May Queen        D. The Holiday of the Year

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