属于常见变应原的是 A.HLA B.青霉素 C.花粉 D.进入血液的精子 E.For

题型:单项选择题

问题:

属于常见变应原的是

A.HLA
B.青霉素
C.花粉
D.进入血液的精子
E.Forssman抗原

考点:临床执业医师医学免疫学抗原
题型:单项选择题

下列划线的词语,使用不正确的一项是(   )(2分)

A.邻近的鸡也很多,也常蹑手蹑脚地来偷鹅的饭吃。我们不厌其烦,以后便将饭罐和水盆放在一起。免得它走远去,让鸡、狗偷饭吃。

B.少年对自然科学,特别是物理学表现出不可遏止的热情。

C.当蟋蟀演奏的时候,妈妈情不自禁地陶醉在当年的情景之中,如痴如梦。

D.它们一律将长颈伸向前方,双足向后方笔直挺伸,悠然翱翔太空的美姿,实在是无可言喻。

题型:单项选择题

Like many languages spoken by people, Ayapaneco is dying. Only two people in the world still speak it, and they won't talk to each other.

Spoken in Mexico for centuries, Ayapaneco is one of 68 surviving languages in the mainly Spanish-speaking nation. The two speakers are Manuel Segovia and Isidro Velazquez. Though they live only 500 meters from each other in the village, the two men seldom talk to each other. Daniel, an American expert, who is working to make a dictionary of Ayapaneco, says the two men “don’t have a lot in common,” and that Segovia can be “active” while Velasquez tends to mind his own business and stay at home.

While Segovia still speaks to his wife and son in Ayapaneco, neither of them can manage more than a few words. Velasquez hardly speaks his native tongue any more. Daniel is working to preserve the language in dictionary form before its last surviving speakers pass away. According to Daniel, Ayapaneco and the other languages began dying out with the introduction of public Spanish education in the mid-20th century. For decades, local children weren’t allowed to speak anything else. Many people to cities, starting in the 1970s, also helped the dying out of native languages.

Ayapaneco is the name given to the language; Segovia and Velazquez call it “Nuumte Oote”, which means “true voice”. Neither man, however, speaks the same language. The dictionary will contain two versions(版本) of the language when it comes out later this year. Those behind the dictionary aren’t the only ones trying to save Ayapaneco. The National Language Institute plans to hold classes so that Segovia and Velasquez can pass on what they know to children.

It is thought that there are about 6,000 languages spoken on earth and that about half will disappear over the next 100 years. Let’s hope the “true voice” isn’t one of them.

小题1:Segovia and Velasquez seldom talk to each other in Ayapaneco because they___________________.

A.both dislike the language

B.don’t get along well with each other

C.are too busy to talk to each other

D.don’t share the same interests小题2:Which are the main reasons why the language Ayapaneco started dying out? 

a. No teacher liked to teach it.         b. Local children had to speak Spanish.

c. many villagers went to live in cities.  d. The surviving speakers didn’t like to use it.

A.a, b

B.a, c

C.b, d

D.b, c小题3:How does the National Language Institute try to save Ayapaneco?

A.Write a dictionary of Ayapaneco.

B.Let Ayapaneco be taught at school.

C.Introduce a public Ayapaneco education.

D.Ask villagers to speak Ayapaneco.小题4:From the text we learn that the author____________________.

A.agrees that it is natural that Ayapaneco should die out

B.thinks Daniel’s effort to preserve Ayapaneco won’t work

C.thinks highly of Ayapaneco and wants people to learn it

D.hopes that Ayapaneco will not die out in the future

题型:单项选择题

炎热的夏天,一辆洒水车在平直的马路上匀速行驶。在工作的过程中,洒水车的动能________,重力势能________。(选填“变大”、“变小”或“不变”)

题型:单项选择题
将一个轻小的通草球A用丝线吊起来,为了确定它是否带电,以下方法中不能达到目的是(  )

A.用不带电的验电器的金属球去接触A,若金属箔张开,则A球带电

B.用一些碎纸屑去靠近A,若纸屑被吸引,则A球带电

C.用另一个带电的小球B去靠近A,若互相推斥,则A球带电

D.用另一个带电的小球B去靠近A,若互相吸引,则A球带电

题型:单项选择题

海明威因其作品《老人与海》而获得诺贝尔文学奖,在这部作品中,他塑造了桑地亚哥这个海明威式的“可以被消灭但不能被打倒”的“()”性格典型。

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