The best title for this passage might be ______________

A．Colds and Viruses

B．Ways to Avoid Colds

C．The Spread of Viruses

D．Hand Contact and Transmission of Viruses

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参考答案

答案解析

【答案】B
【题型】主旨题
【解析】题干意为“文章最佳标题为…”。文章首句就说明介绍几种避免感冒的方法，接下来都是围绕这个主题展开的，故选B。

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1 根据以下资料，回答题：
Directions : This task is the same as Task 1．The 5 questions or unfinished statements are numbered 41 to 45. The human brain contains 10 thousand million ceils and each of these may have a thousand connections．Such enormous numbers used to discourage us and cause us to dismiss the possibility of making a machine with human-like ability, but now that we have grown used to moving forward at such a pace we can be less sure． Quite soon, in only 10 or 20 years perhaps, we will be able to assemble a machine as complex as the human brain, and if we can we will．It may then take us a long time to render it intelligent by loading in the right soft ware (软件) or by altering the architecture but that too will happen.
I think it is certain that in decades, not centuries, machines of silicon(硅) will arise first to rival and then exceed their human ancestors． Once they exceed us they will be capable of their own design．In a real sense they will be able to reproduce themselves．Silicon will have ended carbon' s long control．And we will no longer be able to claim ourselves to be the finest intelligence in the known universe.
As the intelligence of robots increases to match that of humans and as their cost declines through economies of scale we may use them to expand our frontiers, first on earth through their ability to withstand environments, harmful to ourselves．Thus, deserts may bloom and the ocean beds be mined．Further ahead, by a combination of the great wealth this new age will bring and the technology it will provide, the construction of a vast, man- created world in space, home to thousands or millions of people, will be within our power.
In what way can we make a machine intelligent?

A．By making it work in such environments as deserts, oceans or space.

B．By working hard for 10 or 20 years.

C．By either properly programming it or changing its structure.

D．By reproducing it.

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2 What does the writer think about machines with human-like ability?

A．He believes they will be useful to human beings.

B．He believes that they will control us in the future.

C．He is not quite sure in what way they may influence us.

D．He doesn' t consider the construction of such machines possible.

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3 The word "carbon" ( Line 3, Para．2 ) stands for ______________

A．intelligent robots

B．a chemical element

C．an organic substance

D．human beings

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