摘要: We can see many programmers on it. It’s very fun. When we are free, we can enjoy it. Step6. Talk about the next questions:

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  About ten men in every hundred have the trouble of color blindness in some way.Women are luckier, only about one in two hundred is affected(感染)in this matter.Perhaps, after all, it is safer to be driven by a woman.

  There are different kinds of color blindness.For example, a man cannot see deep red.He may think that red, orange and yellow are all shades(阴影)of green.Sometimes a person can’t tell the difference between blue and green.Only a few unlucky men may see everything in shades of green-a strange world indeed.

  Color blindness in human beings is a difficult thing to explain.In only one eye there are millions of very small things called “cones(圆锥体)”.These help us to see in the bright light and to tell differences between colors.There are also millions of “rods(柱状体)”, but these are used for seeing when it is nearly dark.They show us shapes but not colors.

  Some insects have favorite colors.Mosquitoes(蚊子)like blue but do not like yellow.A red light will not attract insects, but a blue light will.Human beings also have favorite colors.Yet we are lucky.With the help of the cones in our eyes, we can see many beautiful colors by day, and with the help of the rods we can see shapes at night.

(1)

“Color blindness” means “________” in Chinese.

[  ]

A.

盲目

B.

无色

C.

色盲

D.

讨厌颜色

(2)

Some people say it’s safer to be driven by women because ________.

[  ]

A.

women drive more carefully

B.

women are better at driving than men

C.

women can see things more clearly

D.

there are fewer color-blind women

(3)

With the help of the “cones”, we can ________.

[  ]

A.

tell different shapes

B.

kill insects

C.

see in the dark

D.

tell orange from yellow

(4)

________ show us shape at night.

[  ]

A.

rods

B.

insects

C.

cones

D.

mosquitoes

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  In the sea there are many islands. In its warm waters there are some little ones. We call them “Coral Islands”(珊瑚岛).

  A coral island is very nice to look at. It looks like a ring of land(一圈陆地) with trees, grass, and flowers on it. One part of the ring is open to the water. There is a little round lake inside the island.

  If you look into this lake, you will see beautiful coral. You may think they are flowers.

  If you look at a piece of coral, you will see many little holes in it. In each of these holes a very small sea animal has lived. These sea animals make the coral. They began to build under the water. Year after year, the coral grew higher and higher. At last it grew out of the water.

  Then the sea brought to it small trees and something else. After some years, these things changed into earth. Sometimes the wind brought seeds to this earth. Sometimes birds flew over it and brought seeds(种子) to the island.

  The little seeds grew. In a few years there were plants all over the island. In a few more years there were trees growing there.

  So you see, these islands were built little by little. The workers were very small. Do they not teach us a lesson? Can you think what the lesson is?

1.In the sea ________.

[  ]

A.there are coral islands in all places

B.there are some coral islands

C.the water is always warm

D.we can see many flowers

2.A coral island looks like ________.

[  ]

A.a round cake
B.trees, grass and flowers
C.a ring of land
D.a round lake

3.There are ________ in the holes in corals.

[  ]

A.flowers
B.little corals
C.grass
D.sea animals

4.How did seeds of trees, grass and flowers come to the coral islands?

[  ]

A.The wind and birds brought them to the coral islands

B.Only the wind brought them there

C.People brought them there

D.Fishes brought them there

5.From the story we learn that ________.

[  ]

A.small workers can't do big things

B.only big workers can do big things

C.small workers can do big things if they work hard and work a long time

D.all small things can do big things

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