Look into the mirror and what do you see? You see yourself. But when you move. you do everything backward(相反地)in the mirror! If you wave your left hand, your right hand waves in the mirror. If you wink your right eye, your left eye, your left eye winks(眨). Try to read a page in the mirror .The words will be backwards.

What is really happening? You do not see through the glass of a mirror as you do through a window. The glass of a mirror has a silver coating on the back. The light from the sun or a bulb bounces (弹回)off you ,goes into the mirror ,and bounces straight back out to you again.

Mirrors have been used for thousands of years. The earliest were round pieces of shiny metal. Glass mirrors came late. The ancients thought that a mirror was magic. They did not understand how it worked. They thought they saw their spirits in a mirror and breaking a mirror brought bad luck.

Today mirrors have many uses .For example, they can make rooms look bigger and prettier. They also show us if our hair is combed(梳理) well and our faces are clean. On cars, buses and trucks, mirrors help drivers see traffic behind them. Mirrors are also used in telescopes(望远镜)and searchlights(探照灯).

Fun houses use mirrors. They make people look funny. Some mirrors are curved to make people seem short and round or tall and tin They make people laugh at themselves.

1.If you wave your right hand, you can see your         In the mirror.

A. left hand down     B. left hand wave

C. right hand wave    D. right hand up

2.Mirrors        .

A. appeared a long time ago

B. were made of glass at first

C. made of metal are popular today

D. had many uses in ancient times

3.Mirrors were magic in the past because       .

A. people thought they could see their spirits in mirrors

B. they were used in magic shows

C. they could make people change their heights and weights

D. they could make people laugh

4.What does the word “curved” mean in Chinese?

A.雕刻       B.油漆      C.扭转       D.弯曲

Look into the mirror and what do you see? You see yourself. But when you move. you do everything backward(相反地)in the mirror! If you wave your left hand, your right hand waves in the mirror. If you wink your right eye, your left eye, your left eye winks(眨). Try to read a page in the mirror .The words will be backwards.
What is really happening? You do not see through the glass of a mirror as you do through a window. The glass of a mirror has a silver coating on the back. The light from the sun or a bulb bounces (弹回)off you ,goes into the mirror ,and bounces straight back out to you again.
Mirrors have been used for thousands of years. The earliest were round pieces of shiny metal. Glass mirrors came late. The ancients thought that a mirror was magic. They did not understand how it worked. They thought they saw their spirits in a mirror and breaking a mirror brought bad luck.
Today mirrors have many uses .For example, they can make rooms look bigger and prettier. They also show us if our hair is combed(梳理) well and our faces are clean. On cars, buses and trucks, mirrors help drivers see traffic behind them. Mirrors are also used in telescopes(望远镜)and searchlights(探照灯).
Fun houses use mirrors. They make people look funny. Some mirrors are curved to make people seem short and round or tall and tin They make people laugh at themselves

1. 1.

   If you wave your right hand, you can see your         In the mirror

   1. A.
      left hand down
   2. B.
      left hand wave
   3. C.
      right hand wave
   4. D.
      right hand up
2. 2.

   Mirrors       

   1. A.
      appeared a long time ago
   2. B.
      were made of glass at first
   3. C.
      made of metal are popular today
   4. D.
      had many uses in ancient times
3. 3.

   Mirrors were magic in the past because      

   1. A.
      people thought they could see their spirits in mirrors
   2. B.
      they were used in magic shows
   3. C.
      they could make people change their heights and weights
   4. D.
      they could make people laugh
4. 4.

   What does the word “curved” mean in Chinese?

   1. A.
      雕刻
   2. B.
      油漆
   3. C.
      扭转
   4. D.
      弯曲

Look closely at your hands. Are they clean? It doesn't matter how many times you wash your hands, tiny microbes (微生物) still stay on them. But don't worry. Most microbes don't harm you.
Now scientists say the microbes on our hands could be used in a surprising way; fighting crime, According to a recent survey microbes as well as fingerprints(指纹) could be used to indentify the criminal.
Everyone has his own set of microbes on the hands. That is to say, if you and your best friend were able to see and compare all the microbes on your hands, your hands probably would look different. Some microbes only show up on your hands while others live only on your friend's hands.
When you work on a computer you leave the microbes from your hands on the keyboard. The scientists can easily tell the owner of the keyboard by looking at the microbes on it. Even if you don't leave your fingerprints behind, your microbes may give you away.
Noah Fierer, a scientist, says. "You can only clean a fingerprint, but you can't sterilize (使无菌) a surface just by wiping(擦) it off," He says that scientists have a lot more work to do before the microbe is used as a useful tool.
【小题1】According to the passage,_______ could be used to identify the criminal.

A．Microbes May Tell Who You Are	B．Scientists Say Everyone Has Microbes
C．Noah Fiercer Does Research Into Microbes	D．Fingerprints Help Catch Criminals