阅读理解。

Computers can injure you. Most other injuries happen suddenly. For example, if you fall off a bike and break your arms, it happens very quickly. But computer injuries slowly.

You probably know how to ride a bike safely. Now learn to use a computer safely.

Your Eyes

Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be at least 50 centimeters from the screen. Remember to look away from it sometimes. This gives your eyes a rest.

When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect on(反射) the screen. If the window is in front of you, the sun and the screen will both shine into your eyes.

Your Hands and Wrists(手腕)

Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long time, follow these three rules: 1) Rest your wrists on something. 2) Keep your elbows at the same height as the keyboard. 3) Stop something and exercise your hands, wrists and fingers in a different way.

Your Back

Some people sit for many hours in front of a computer. If you sit in the wrong way, you can injure your back or your neck. So you should sit with your back straight. The top part of the screen should all be in front of your eyes. Your forearms, wrists, hands and the upper part of your legs should all be parallel(平行) to the floor. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and necks.

Enjoy your computer, but use it safely.

1.A computer screen may injure your eyes if .

A.you sit 60 centimeters away

B.you remember to look away

C.your eyes are too close to it

D.the window is on your left or your right

2.Hand and wrist injuries are caused when you .

A.get plenty of exercise

B.move in the same way again and again

C.rest your wrists on something

D.keep your elbows as high as the keyboard

3.Your eyes and hands will be safe if .

A.you work near a window

B.you often take a rest from working

C.you use a keyboard for a long time

D.the window is behind you

4.It is good for your back and neck if you sit .

A.in the right way

B.for many hours

C.with the screen below your eyes

D.with your back leaning forward

5.What is the best title for the passage?

A.How to Protect Your Eyes

B.How to Protect Your Hands and Wrists

C.How to Use a Computer Safely

D.How to Protect Your Back

阅读理解。

Robots are supposed to run on batteries, right? Well not all of them.

Scientists in England have built a kind of small robots that get their energy from dead flies, bad apples, or sugar.

One robot, called Slugbot, was even designed to hunt(猎取) garden slugs for dinner!

What's up with all that food?

Well, scientists at the Bristol Robotics Laboratory want to invent robots that can operate for a long time in dark, dirty, or dangerous places.

Many of those spots, like the seafloor or Antarctica, don't have electrical sockets(插座).

So inventor Chris Melhuish came up with a better idea: Build robots that get their energy just like animals do by hunting and eating food from their environment.

One robot, called Ecobot Ⅱ, could run for 12 days on a diet of eight flies! Of course, it'd still get a lot more power from one AA battery, though.

Melhuish says his team is now working on a new and improved robot, called Ecobot III, which will have a better digestion system.

It seems that after an eight fly dinner, Ecobot II couldn't deal with the leftover(剩下的) "waste".

Maybe restrooms in the future will have signs for boys, girls, and robots.

1.An ordinary robot usually .

A.gets its energy from sugar

B.depends on batteries to work

C.can get food for itself

D.can work a few minutes without energy

2.From the passage, we can infer that a slug .

A.is a kind of insect B.is a kind of fish

C.can't see Slugbot D.can eat Slugbot

3.What kind of robots do inventor Chris Melhuish want?

A.Robots that can provide people with food.

B.Robots that can work in dangerous places.

C.Robots that can get energy for themselves.

D.Robots that can be very small.

4.Which of the following is NOT true according to this passage?

A.Robots need to work in places that have no sockets for power.

B.Melhuish is not very satisfied with Ecobot Ⅱ.

C.Maybe there will be three kinds of restrooms in the future.

D.Ecobot Ⅱ can turn its flies into energy completely.

5.What does the passage mainly tell us?

A.Robots are hard things to invent.

B.Scientists are working to improve robots.

C.Robots in the future need to eat food like human.

D.Scientists at the Bristol Robotics Laboratory are good at robots.

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