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 success of mankind.

Since 1960 a new kind of tool has appeared. This is the silicon chip -- a little chip of silicon crystal. It is smaller than a finger nail, but it can store more than a million "bits" of information. It is an electronic brain. Every year these chips get cleverer, but their size gets smaller, and their cost gets less. They are used in watches, calculators and intelligent machines that we can use in many ways. In the future we will not need to work with tools in the old way. Machines will do everything for us. They will even talk and play games with us. People will have plenty of spare time. But what will they do with it?

Human beings used stone chips for more than two million years, but human life changed very little in that time. We have used silicon chips for only a few years, but life is changing faster every day. What will life be like twenty years from now? What will the world be like two million years

from now?

1.From paragraph，we can know .

A. why early human beings cut skin from dead animals

B. how early human beings discovered the tools

C. what early human beings used the tools for

D. what food early human beings stored

2.The stone chip is thought to be the most important tool because it ______.

A. was very important to the development of mankind

B. led to the invention of machines in the early time

C. developed cooking abilities of mankind

D. was one of the first tools of mankind

3.The silicon chip is mentioned in the passage to________.

A. show the changes of tools

B. introduce a new kind of tool

C. give an example of using tools

D. compare the effects of two kinds of tools

4.At the end of the passage the author seems to suggest that life in future is ______.

A. Out of order B. Less colorful

C. hard to predict D. full of meanings

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Summer Holiday Fun 2015!

The summer holidays are upon us again. Here is our guide to summer holiday fun in Peterborough!

Peterborough Museum

The Age of the Dinosaurs is the museum's main attraction this summer. Get up close to prehistoric creatures via some great hands-on exhibits！Watch out for monsters lurking around every ember！The museum is open from 10:00 am to 5:00 pm Monday to Saturday，and from 12:00 pm to 4:00 pm on Sundays in August.

Call 01733 864663 for details.

School holiday fun：Young people aged 13—19 will be able to produce their own music，compete in sports activities，or try their hand at cooking at Saxon Youth Club，Saxon Community Centre，Norman Road，Peterborough every Monday and Wednesday from 3:00 pm. PLUS an aero ball tournament will take place on Thursday,12th August between 3:30 pm and 6:30 pm.

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Houghton Mill

Through the Looking Glass—a new production of the family favorite on Monday 30th，August. Bring rugs or chairs to sit on and a picnic if you wish to eat during the play. Gates open 5:30 pm，performance 6:30 pm—8:30 pm. Tea room will be open until the end of the interval. Adult ￡ 10. Child ￡7. Family ￡20.

Booking advisable on 0845 4505157.

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B. Watching the new play.

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People typically wash their hands seven times a day in the United States, but they do it at a far higher temperature than is necessary to kill germs (病菌) , a new study says. The energy waste is equivalent to the fuel use of a small country.

Amanda R. Carrico, a research assistant professor at the Vanderbilt Institute for Energy and Environment in Tennessee, told National Geographic that hand washing is often “a case where people act in ways that they think are in their best interest, but they in fact have inaccurate beliefs or outdated perceptions.”

Carrico said, “It’s certainly true that heat kills bacteria, but if you were going to use hot water to kill them it would have to be way too hot for you to tolerate.”

Carrico said that after a review of the scientific literature, her team found “no evidence that using hot water that a person could stand would have any benefit in killing bacteria.” Even water as cold as 40°F (4.4°C) appeared to reduce bacteria as well as hotter water, if hands were scrubbed, rinsed（沖洗）and dried properly.

Using hot water to wash hands is therefore unnecessary, as well as wasteful, Carrico said, particularly when it comes to the environment. According to her research, people use warm or hot water 64 percent of the time when they wash their hands. Using that number, Carrico’s team calculated a significant impact on the planet.

“Although the choice of water temperature during a single hand wash may appear unimportant, when multiplied by the nearly 800 billion hand washes performed by Americans each year, this practice results in more than 6 million metric tons of CO2 equivalent emissions annually,” she said.

The researchers published their results in the July 2013 issue of International Journal of Consumer Studies. They recommended washing with water that is at a “comfortable” temperature, which they noted may be warmer in cold months and cooler in hot ones.

1.What’s the meaning of what Carrico told National Geographic in the second paragraph?

A. People are more concerned about their health and begin to wash their hands.

B. It’s important for people to wash their hands to keep healthy.

C. Generally, people’s hand washing behaviors and perceptions are not correct.

D. People like washing their hands very much.

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A. using hot water to wash hands has a bad influence on our planet.

B. air pollution has become more and more serious.

C. using hot water to wash hands is a waste of energy.

D. people should pay more attention to the environment around us.

3.This passage is organized in the pattern of __________.

A. fact and opinion B. cause and effect

C. definition and classification D. time and events

4.What can we learn from the passage?

A. It’s necessary and useful for people to wash their hands frequently every day.

B. We can wash our hands with water that is at a “comfortable” temperature.

C. Using cold water to wash hands is necessary and much healthier.

D. Hot water can’t kill germs.

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