试题与答案

因为______功总小于______功,所以机械效率总小于1.提高机械效率的途径

题型:填空题

题目:

因为______功总小于______功,所以机械效率总小于1.提高机械效率的途径是减小______功.

答案:

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题型:完形填空

The eyes are the windows of the soul (心灵) .Having a pair of bright , clear eyes is very important , so we should protect our eyes throughout our lives.

_____小题1:____ Don’t read while lying down or walking. Relax after every hour of reading .

Keep a distance from the TV set when you watch TV and give your eyes a rest every 30 minutes.

Don’t stare at (盯着看) the sun or try to read in the darkness. __小题2:____ This can damage your eyes easily .

Get your eyes checked often .Not many people have this habit , but it is necessary . If you feel that there is something wrong with your eyes , get them checked quickly .____ 小题3:___.

_小题4:___ . You can close your eyes for a few seconds or look into the distance for one or two minutes. A small break will relax your eyes and help to stop you from getting eye problems.

Be careful when you choose your glasses.___ 小题5:____ . Make sure your glasses are right for you . If they don’t feel right , get your glasses changed .

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B.Rest your eyes whenever you can.

C.Make sure you get enough sleep every night .

D.Glasses that aren’t suitable for you could bring you trouble.E. Even if you’re wearing sunglasses , never look for directly at the sun.

F. Eye problem can be found and treated early with regular checks.

G. Drink green tea every day as a way to protect your eyes against eye problems.

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