Question

    Has anyone ever told you that eating carrots will help you see in the dark? This is just one of many incorrect beliefs you may have heard. Below, TEENS has picked out scientific explanations for three mistakes that people make about their eyes. Let's take a look.

Can eating carrots improve your eyesight?

Carrots are rich in vitamin A, which helps the eyes to turn light into information for your brain. This allows people to see in darker places. However, eating more carrots won't help you see better. A certain minimum amount will help, but a large number of carrots will not give you superhuman vision.

If your parents have bad eyesight, will you have bad eyesight, too?

Myopia( 近 视 ) can be passed from parents to children. A study by the American Optometric Association found that if both parents are myopic, there's a 33 to 60 percent chance that their child will be. For children who have one parent with myopia, the chance is 23 to 40 percent, and it's down to 6 to 15 percent for kids with non-myopic parents. So if your eyesight is bad, your children might still have good vision.

Do color blind people see the world in black and white?

Color blindness doesn't usually mean that people see the world like an old movie. They usually can't tell certain colors apart, especially green and red. Another commonly confused pair of colors is yellow and blue. Our eyes have cone cells (视锥细胞) that sense different wavelengths of light. If these cells don't work properly, color blindness occurs. There are different levels of color blindness. Some people are only color blind in low light. However, in the most serious form of color blindness, everything is shades of gray.

1.According to the article, eating carrots________.

A.stops the brain from seeing B.doesn't help you see better at all

C.will help you see clearly in the dark D.is good for your eyes to some degree

2.If both parents have myopia, their child's chance of having good eyesight is________.

A.40-67% B.33-60% C.23-40% D.6-15%

3.The underline word“occurs”in this passage probably means________.

A.恶化 B.发生 C.改善 D.加深

4.What is the cause of color blindness according to the text?

A.Watching movies for too long . B.Getting too little exercise.

C.Cone cells not working properly. D.Changes in the wavelength of light.

5.What is the purpose of the article?

A.To offer some advice on protecting your eyes.

B.To clear up some misunderstandings about our eyes.

C.To provide help for improving your vision.

D.To explain how bad eyesight and color blindness form.

Answer

1.D

2.A

3.B

4.C

5.B

【解析】

本文是一篇说明文。文章主要介绍了青少年们为人们对眼睛所犯的三个错误做出了科学的解释，消除一些关于人们眼睛的误解。

1.

细节理解题。根据文中第二段Can eating carrots improve your eyesight? 里的内容“Carrots …which helps the eyes to turn light into information for your brain. This allows people to see in darker places. However, eating more carrots won't help you see better.”可知胡萝卜富能帮助眼睛将光线转化为大脑的信息。这使得人们可以在黑暗的地方看到东西。然而，多吃胡萝卜并不能帮助你看得更好。也就是说吃胡萝卜在某种程度上对眼睛有好处。故选D。

2.

细节理解题。根据文中第三段If your parents have bad eyesight, will you have bad eyesight, too? 里的内容“…both parents are myopic, there's a 33 to 60 percent chance that their child will be.”可知如果父母都是近视眼，他们的孩子有33%到60%的几率近视。那么他们的孩子有40%到67%的几率拥有好的视力。故选A。

3.

词义猜测题。根据文中第四段Do color blind people see the world in black and white?中“Our eyes have cone cells (视锥细胞) that sense different wavelengths of light.”可知我们的眼睛有锥形细胞，可以感知不同波长的光。“ If these cells don't work properly…”如果这些细胞不能正常运转，那么色盲就会发生。所以“occurs”是发生的含义。故选B。

4.

细节理解题。根据文中最后一段“Our eyes have cone cells (视锥细胞) that sense different wavelengths of light. If these cells don't work properly, color blindness occurs.”可知视锥细胞如果不能正常运转，就会导致产生色盲。故选C。

5.

主旨大意题。根据文中第一段“TEENS has picked out scientific explanations for three mistakes that people make about their eyes. Let's take a look.”可知青少年们为人们对眼睛所犯的三个错误做出了科学的解释。让我们看看。故选B。