关于表皮的下列叙述错误的是()。 A.表皮属于单层柱状上皮 B.表皮主要由角质形成细

题型:单项选择题 A1/A2型题

问题:

关于表皮的下列叙述错误的是()。

A.表皮属于单层柱状上皮

B.表皮主要由角质形成细胞、黑素细胞、朗格汉斯细胞和麦克尔细胞构成

C.角质形成细胞用苏木精-伊红染色即可着色

D.角质形成细胞由外胚层分化而来

E.黑素细胞起源于外胚层的神经嵴

考点:皮肤与性病学主治医师皮肤的结构及功能皮肤的结构及功能题库
题型:单项选择题 A1/A2型题

One day an old man is selling (卖) a big elephant. A young man comes to the elephant and begins to look at it slowly. The old man goes up to him and says in his ear, “Don’t say anything about the elephant before I sell it. Then I will give you twenty dollars.”“All right,” says the young man. After the old man sells the elephant, he gives the young man twenty dollars and says, “Now, can you tell me how you found the elephant’s bad ears?”“I didn’t find the bad ears,” says the young man. “Then why are you looking at the elephant slowly?” asked the old man. The young man answers, “Because I have never seen an elephant before, and I want to know what it looks like.”

根据短文选择正确的答案

(  )11. ________  the elephant.

    A. The young man sells     B. The old man sells

    C. The two men sell        D. The old man buys

(  )12. The young man is looking at the elephant slowly.

He wants to find out ___________.

    A. which foot of the elephant is bad B. how heavy it is

    C. which ear of the elephant is bad D. what it looks like

(  )13. The young man   ______________.

    A. knows the elephant has bad ears B. wants to buy the elephant

    C. looks after the elephant D. gets some money from the old man

(  )14. The young man  ______________.

    A. is not interested in elephants B. knows what an elephant looks like

    C. has seen some elephants before D. has never seen an elephant before

(  )15. Hearing what the young man said, the old man will probably(很可能)be ____________.

    A. angry (生气)      B. happy     C. dangerous      D. hungry

题型:单项选择题 A1/A2型题
定义在R上的函数f(x)满足f(x)=
log 2(1-x),x≤0
f(x-1)-f(x-2),x>0
,则f(2009)的值为(  )
A.-1B.0C.1D.2
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