变配电所建筑物的门应采用( )。A．推拉式 B．向内开启式 C．向外开启式 D．方

— Could I go to the movie this weekend, Dad? 　　 　

— Yes, you _____ . But you have to come back before nine. 　　

[      ]

A. would 　　　

B. could　　　

C. can 　　　

D. must

在土卫六上有许多有机化合物和可能潜在的液体环境。尽管它对于生命来说极其寒冷，它类似于地球早期的环境，为此土卫六是最有可能存在生命的星球之一。科学家对探测器发回的数据进行了分析，发现土卫六的大气层中含有95％的氮气，剩余的气体为甲烷和其它碳氢化合物。下列关于碳氢化合物的叙述正确的是（   ）

A．碳氢化合物的通式为C_nH_2n+2

B．石油的主要成分是碳氢化合物

C．乙炔是含碳量最高的碳氢化合物

D．碳氢化合物中的化学键都是极性键

Ask three people to look out the same window at a busy street comer and tell you what they see. Chances are you will receive three different answers. Each person sees the same scene, but each perceives(察觉) something different about it. 

Perceiving goes on in our minds. Of the three people who look out the window, one may say that he sees a policeman giving a motorist a ticket. Another may say that he sees a rush-hour traffic jam at the intersection. The third may tell you that he sees a woman trying to cross the street with four children in tow. For perception(感知) is the minds’ interpretation of what the senses — in this case our eyes — tell us.

Many psychologists(心理学家)today are working to try to determine just how a person experiences or perceives the world around him. Using a scientific approach, these psychologists set up experiments in which they can control all of the factors. By measuring and charting the results of many experiments, they are trying to find out what makes different people perceive totally different things about the same scene.

小题1:Perceiving is an action that takes place ______.

A．in our eyes

B．only when we think very hard about something

C．only under the direction of a psychologist

D．in every person’s mind小题2:People perceive different things about the same scene because ______.

A．they see different things

B．they can not agree about things

C．some have better eyesight

D．none of these小题3: Psychologists study perception by ______.

A．setting up many experiments

B．asking each other what they see

C．looking out of windows

D．studying people’s eyes小题4:The best title for this article is ______.

A．How We See

B．Learning About Our Minds Through Science

C．What Psychologists Perceive

D．How To Become An Experimental Psychologist

影响机体对缺氧耐受性的因素有（）、（）。

●项目经理在编制项目管理计划时，应__(31)__。

A．越简单越好

B．越详细越好

C．逐步细化

D．按照公司的模板编制，不能变更