题目内容
Your parents might have told you that you'd go blind from reading in the dark, but you could make up for it by eating a lot of carrots.This is just one of the wrong ideas you may have heard of.Here are scientific explanations for three mistakes people often make about our eyes
Can eating carrots improve your eyesight(视力)?
Carrots are rich in Vitamin A, which is essential for our eyes.Vitamin A helps people to see in low light conditions.However, eating more carrots doesn’t help you see better.A certain number of carrots will help, but a large number of carrots will not make you get rid of(摆脱) your glasses.
If your parents have bad eyesight, will you have bad eyesight, too?
Myopia(近视) can be inherited(经遗传得到) from parents.A study found that if both parents have myopia, there is a 33 to 60 percent chance that the child has.For children who have one parent with myopia, the chance is 23 to 40 percent, and it is down to 6 to 15 percent for kids with non-myopia parents.So no matter how bad your parents’ eyesight is, you will have a chance of having good eyesight.
Is it true that people who are color-blind can't see colors?
Color blindness doesn’t mean that someone can’t see colors at all.It means that some has difficulty seeing differences in certain colors, usually green and red or blue and yellow.Color blindness is usually a condition caused by not having cone cells(视锥细胞) or having the cells that don't work.There are different levels of color blindness. Some people cannot tell the differences between colors when light isn’t bright, while others have difficulty in any light.
1.Which of the following is the right idea about eating carrots?
A.Eating carrots doesn't help people see better.
B.People need to eat as many carrots as possible.
C.A certain number of carrots are enough for eyes.
D.Only people who have bad eyesight need to eat carrots.
2.The underlined word “essential” in the passage means “__________”in Chinese.
A.难以获取的 B.稍有影响的 C.极其罕见的 D.必不可少的
3.What can we learn according to the passage?
A.Children may inherit myopia from their parents.
B.Kids with non-myopia parents won't have myopia.
C.A kid has a 50% chance of having myopia if his or her father has myopia.
D.Kids with short-sighted parents won't have good eyesight.
4.What can we know about color blindness from the passage?
A.Having no cone well may cause color blindness.
B.People who are color-blind cannot see colors at all.
C.Those who can't tell green from red are not really color-blind.
D.Most people who are color-blind can only see black and white.
5.What's the best title for the passage?
A.Advice on staying away form myopia.
B.Reasons for bad eyesight and color blindness.
C.Explanations for some wrong ideas about eyes.
D.Medical information about improving your eyesight.
