搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1型题

引起婴儿急性腹泻的最常见病因是（）

A.病毒感染

B.致腹泻大肠杆菌感染

C.食物过敏

D.志贺痢疾杆菌感染

E.乳糖酶缺乏

答案

参考答案：A

阅读理解

阅读理解。

     Laptop computers are popular all over the world. People use them on trains and airplanes, in airports and

hotels. These laptops connect people to their workplace. In the United States today, laptops also connect

students to their classrooms.

     Westlake College in Virginia will start a laptop computer program that allows students to do schoolwork

anywhere they want. Within five years, each of the 1500 students at the college will receive a laptop. The

laptops are part of a ＄10 million computer program at Westlake, a 110-year-old college. The students with

laptops will also have access to the Internet. In addition, they will be able to use e-mail to "speak" with their

teachers, their classmates, and their families. However, the most important part of the laptop program is that

students will be able to use computers without going to computer labs. They can work with it at home, in a

fast-food restaurant or under the trees-anywhere at all!

     Because of the many changes in computer technology, laptop use in higher education, such as colleges

and universities, is workable. As laptops become more powerful, they become more similar to desktop

computers. In addition, the portable computers can connect students to not only the Internet, but also libraries

and other resources. State higher-education officials are studying how laptops can help students. State

officials are also testing laptop programs at other universities, too.

     At Westlake College, more than 60 percent of the staff use computers. The laptops will allow all teachers

to use computers in their lessons. As one Westlake teacher said, "Here we are in the middle of Virginia and

we're giving students a window on the world.They can see everything and do everything."

1. The main purpose of the laptop program is to give each student a laptop to _____. [ ]

A. use for their schoolwork

B. access the Internet

C. work at home

D. connect them to libraries

2. Why is the word "speak" in the second paragraph in quotation marks (引号)? [ ]

A. They don't really talk.

B. They use the computer language.

C. Laptops have speakers.

D. None of the above reasons is correct.

3. Which of the following is true about Westlake College? [ ]

A. All teachers use computers.

B. 1500 students have laptops.

C. It is an old college in America.

D. Students there can do everything.

4. A window on the world in the last paragraph means that students can _____. [ ]

A. attend lectures on information technology

B. travel around the world

C. get information from around the world

D. have free laptops
查看答案
单项选择题


本部分均为单选题，着重考查考生对语言文字的理解与驾驭能力。
这种能力包括：对词、句子、篇章一般意思和特定意义的理解；对比较复杂的概念和观点的准确理解；对语句隐含信息的合理推断；根据上下文，恰当选用词语；准确地辨明句义，筛选信息。
注意：问题可能是选择一个词语或一个句子，使表达最为准确，也可能是考查对文字内容的理解，你的选择应与题目要求最相符合。

阅读以下文字，完成以下问题。
最近一段时间，“大脑”和“芯片”俨然成了国外科学杂志上出现频率最高的关键词之一。
先是10月号的《发现》杂志，用8页的封面故事介绍了科学家如何通过向大脑植入芯片，试图控制记忆、感知和情绪的研究。10月中旬，《自然》杂志网络版登出了一条类似科幻小说中情节的新闻——一位四肢瘫痪的病人在大脑被植人芯片后，已经可以成功地运用意念，操纵计算机和电视。
两年前，纽约州立大学的科学家们曾经完成了一项引起许多争议的研究。他们向老鼠的大脑中植入了可以无线遥控的电极，能够刺激负责胡须触觉的大脑皮层细胞，并通过连带刺激老鼠大脑中的快感中心，强化前一种信号。这样，在一台笔记本电脑的控制下，这些老鼠就成了活生生的“遥控小汽车“，前后左右，无不遵令而为。
虽然这仅是科学家如何通过向大脑植入芯片，试图控制记忆、感知和情绪的研究，但善于生发的评论家认为它拉开了人类从外部控制大脑及动物行为的序幕。但事实上，这种技术依然很不可靠，而且很难进行精确的控制。一切问题的关键，就在人类仍然所知甚微的“大脑编码的秘密”。
几十年前，神经学家们还认为，大脑的编码是相当简单的。然而，近来的研究却推翻了该理论中作为基础的两个假设：首先，神经元并不是仅能完成一项任务，而是在整个生命过程中不断发生改变。其次，神经冲动可能并不是大脑细胞传递消息的惟一途径。
在这些新的研究基础上，研究者们提出了许多新假说。为假说提供佐证的，是一系列进一步的试验室研究。控制大脑和大脑控制是这些研究的两个主要方向，前者试图通过掌握和模拟大脑的编码，强化或弥补大脑的某些功能；后者则希望通过感受器捕捉并转化固定的编码信息，从而实现脑与计算机或智能设备间的交互。
在大脑控制领域，植入猴子大脑皮层运动区的电极能够监测到手臂做特定运动时发出的信号(经特定算法处理)，这些同样的信号再经算法处理后，可以使机械手臂做出同样的动作。
虽然存在种种优点，但向大脑植入芯片有其无法回避的技术问题。在过去的十几年中，科学家已经能制造出体积足够微小、包含几百个甚至是上万个电极的芯片，其中每个电极都能监测到一个神经元的活动。然而，头骨钻孔和植入电极有感染和损伤大脑的危险，[ ]，目前还不允许向健康人大脑中植入电极。其次，虽然芯片中电极的数量显著增加，但并不是所有电极都能一直接触到神经元。

文中[ ]应填人的词语是( )。

A．并且

B．尽管

C．因此

D．显然
查看答案