抗原的特异性取决于（） A.抗原的化学组成 B.抗原分子量的大小 C.抗原结构的复杂

6台挖土机每天工作5小时，挖长100米，宽15米，深3米的一条沟用10天；10台挖土机，每天工作8小时，挖长150米，宽20米，深4米的一条沟，需要______天．

阅读理解。

        Personality types are linked with structural differences in the brain, which could explain why one

child grows up to be impulsive (冲动的) and outgoing while another becomes diligent and introspective. 

        Structural differences between the brains of 85 people have been measured and linked with the

four main categories of personality types, which were classified as“novelty seeking”， characterized

by impulsive actions; “harm avoidance”， marked by pessimism and shyness; “reward dependence”，

with an addictive personality; and “persistence”， who are people tending to be diligent, hardworking

and perfectionists. 

        The researchers said the brain differences are structural and can be measured in the size of specific

regions of the brain that appear to be linked with each of the four personality types. For instance, people

defined as noveltyseeking personalities had a structurally bigger area in the brain while people with

harmavoidance personalities had significantly smaller volumes of tissue in brain regions.

        The fact that characteristics are reflected in specific structural differences is useful to know, for

instance, when it comes to understanding a child's behavior and choosing the right approach so that

somebody who is, for example, particularly timid, might be helped through education and development. 

        There is no point shouting at a child who is very shy and telling them off, because it does not come

naturally to them to put themselves forward. But actually knowing there is a biological basis for this

helps educators or parents to use the right approach to help a child to compensate. 

        People who have a rewarddependence personality could, for example, be helped at an early age

because they are at risk of turning to drink, drugs or food if they do not get the family support and

encouragement they need. 

        “This study shows that personality characteristics are something you are born with, but their full

expression can be adjusted during development with the right approach.” said Professor Venneri, who

carried out the study with colleagues from the University of Parma in Italy and Washington University

in St Louis. 

        If you know it's not something you do but something you are, you can change the environment

to reduce the risk. Knowing that someone has such a predisposition (体质)could help them adopt

preventive strategies and avoid situations where they might seek rewards which could be potentially

harmful.

1．Which type of person may turn out to be drugabusers?

A. “Novelty seeking”.

B. “Reward dependence”．

C. “Harm avoidance”.

D. “Persistence”．

2．Which of the following is true about shy people?

A. They are often shouted at and scolded.

B. They can naturally put themselves forward.

C. They structurally have a smaller brain region.

D. They are too timid to be educated and helped.

3．What's the main idea of the passage?

A. People have chances to change their personality types.

B. Scientists have identified four different personality types.

C. Structural differences in the brain have effects on education.

D. Personality types are related to structural differences in the brain.

4．The author writes the passage to________.

A. present a fact

B. argue a claim

C. support a research

D. introduce an approach

对于施工现场喷涂、油漆之类的工序质量检查，宜采用的检验方法是（）。

A.分析法

B.量测法

C.试验法

D.目测法

酒精具有较强杀菌作用的浓度范围是（）。

A、60%～65%

B、70%～75%

C、80%～85%

D、90%～95%

[听力原文] ？？你也许不一定能意识到，在你身上大约一百万亿个细胞中，只有10%是真正属于人类的，其余90%占据身体的完全是外来者，包括细菌、真菌，以及其他各种各样的微生物…… ？？比如，在你的眼睫毛上，有一种非常微小的细菌。它们长年累月地在那儿饮食起居，几乎从不离开。极偶然地，趁你夜间熟睡的时候，它们会悄悄离开你的眼睫毛，到你的脸上做一次“夜间散步”。 ？？只要你生过水痘，有一种病毒就会永远地存在于你的体内。当生活中压力增加、人体老化或者健康水平下降的时候，这种病毒就有可能重新活跃起来，使你产生顽固性的疼痛。 ？？假如你不经常刷牙，你的牙齿表面就会有一层三百到五百个细胞厚度的细菌膜。它们在你一长出牙来时就会来报到，一直要等到你的满口牙齿全都掉光后才会悄悄离开。 ？？我们每一个人都是一个行走着的生态系统，因为在我们身体里居住着为数众多的“外来户”，是一个需要和谐共处的小小“联合国”。但是，这些“国家”很难有长久的和平，这就表明我们人类不可能永远健康，只有不断地进行调节，努力达到平衡，才能将健康的状态延续得长一些。 在人身上的细胞中，真正属于人类的有多少？（）

A．10% 

B．50% 

C．90% 

D．100%