毛细血管适于物质交换的特点是( ) ①数量多,分布广 ②管壁薄,只有一层细胞构成

题型:选择题

问题:

毛细血管适于物质交换的特点是(  )

①数量多,分布广

②管壁薄,只有一层细胞构成

③管内流速慢

④管径窄只能红细胞单行通过

⑤管壁厚,弹性大.

A.①②③

B.②③④⑤

C.①②③④

D.①②③④⑤

考点:血管的分类和功能
题型:选择题

引起肾盂肾炎的致病菌中,以下哪种细菌最多见

A.大肠杆菌

B.肠球菌

C.变形杆菌

D.副大肠杆菌

E.金黄色葡萄球菌

题型:选择题

阅读理解。

                                                How to take care of the needy

     The charm of a city is not the level of its tolerance (宽容), but the humanistic care and warmth it offers

to disadvantaged groups. Last week, Beijing's urban administration and civil administration departments

began an intensive winter relief camp to persuade people forced to sleep on the streets to move to relief

centers, which was met with a cold response. But the government wouldn't abandon their efforts to help

the needy.

     Actually, it is not new for people used to sleeping on the streets to refuse to shift to relief centers.

There are three main reasons why they do so. First, the lack of understanding among the staff at such

centers has produced a sense of fear and strangeness among destitute people. Second, a relief center is

less convenient for such people and many of them, such as professional beggars, could even lose their

"jobs". And third, many of them know that they would finally be sent back home, which they want to

avoid.

     Since the homeless are quite defensive, it would be better if officials take a friendly and patient attitude

to persuade them to move into relief centers. The officials have to explain to people that relief centers are more comfortable and convenient.

     Besides, the government could build open centers, which are less formal than the existing relief centers, to provide temporary (临时的) place to professional beggars and garbage collectors, instead of forcing

them to return to their villages and towns.

     A more flexible institutional arrangement could help clear the streets of extremely poor people.

     Since the existing relief system is "non-professional", experts argue that more legal methods and

management measures are needed to deal with professional beggars, especially because persuasion alone

cannot stop them from begging.

     Also, more measures have to be taken to make the system perfect.

1. Which of the following is NOT the reason why the beggars refused to move to the relief centers?

A. The staff at relief centers makes them feel uncomfortable.

B. The existing relief centers are "non-professional".

C. Many beggars do not want to be sent back to their original villages or towns.

D. Moving to relief centers will probably cause economic losses to the professional beggars.

2. Which of the following words can take the place of "destitute" in the third paragraph?

A. poor          

B. hungry      

C. ordinary        

D. unfriendly

3. What can we conclude from the passage?

A. The charm of a city is decided by the humanistic care offered to disadvantaged groups. 

B. the existing relief centers are not comfortable or convenient.

C. many homeless people welcomed the winter relief program well.

D. the present relief system for beggars is not perfect

4. What is the attitude of the author towards the winter relief camp?

A. positive      

B. negative      

C. neutral        

D. not caring about

题型:选择题

文物:历史遗留下来的在文化发展史上有价值的东西。下列属于文物的一项是( )

A.秦兵马俑

B.年近七十岁的王老一直保存着童年时画的有纪念意义的图画

C.黄果树瀑布

D.陈老板用了近十年的宝马汽车

题型:选择题

设三阶矩阵


t为何值时,矩阵A,B等价说明理由.

题型:选择题

购销双方按合同进行商品交易,因延期付款而签发的反映债权债务关系的信用凭证是 ______。

A.应付账款

B.票据贴现

C.应收票据

D.应付票据

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