[单项选择] Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily. Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to the success of mankind. Since 1960 a new kind of tool has appeared. This is the si
A. disastrous.
B. unpredictable.
C. exciting.
D. colourful.

[单项选择] Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily. Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to the success of mankind. Since 1960 a new kind of tool has appeared. This is the si
A. was one of the first tools.
B. developed human capabilities.
C. led to the invention of machines.
D. was crucial to the development of mankind.

[单项选择]
Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily.
Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to the success of man
A. Human beings didn’t have sharp teeth like other meat-eating animals and tools helped them to get food more easily.
B. Tools helped to develop human intelligence.
C. Tools helped the human beings to cut meat and skin from dead animals.
D. It was easy to make stone tools.

[填空题]In the pursuit of happiness human beings have always worried about missing its reality.

[单项选择]

Human beings have always had an ability to attend to several things at once. Nor is electronic multitasking entirely new: We’ve been driving while listening to car radios since they became popular in the 1930s. but there is no doubt that multitasking has reached a kind of warp speed in the era of Web-enabled computers, when it has become routine to conduct several IM (及时通讯) conversations, watch TV and use the computer all at once.
But what’s the impact of this media consumption And how are these multitasking devices changing how kids learn, reason and communicate with one another Social scientists and educators are just beginning to deal with these questions, but the researchers already have some strong opinions.
Although multitasking kids may be better prepared in some ways for today’s fast-paced work places, Many scientists are positively alarmed by the trend.Kids that are instant messaging while doing homework, playing games onli
A. How is multitasking define (定义) in the information age
B. How do people see new technology and the social change it brings about
C. How does technology change modem family life
D. What’s the impact of multitasking on young people

[单项选择]Did you know that all human beings have a "comfort zone" regulating the distance they stand from someone when they talk This distance varies in interesting ways among people of different cultures.
Greeks, some of the Eastern Mediterraneen, and many of those from South America normally stand quite close together when they talk, often moving their faces even closer as they warm up in a conversation. North Americans find this awkward and often back away a few inches. Studies have found that they tend to feel most comfortable at about 21 inches apart. In much of Asia and Mrica, there’s even more space between two speakers in conversation. This greater space subtly lends an air of dignity and respect. This matter of space is nearly always unconscious, but it is interesting to observe.
This difference applies also to the closeness with which people sit together, the extent to which they lean over one another in conversation, how they move as they argue or make an emphatic (强调的) poi
A. take someone’s arm to help him across a street
B. direct someone along an unfamiliar street
C. hate bodily contact
D. both A and Ｂ.