Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin

Vitamin D helps bones and muscles growstrong and healthy. Low levels of vitamin D can lead to diseases such as rickets(佝偻病), mainly foundin children. The thinning of bone is a common problem as people, especiallywomen, get older.

But more and more research is suggestingthat vitamin D might also help prevent many diseases. The easiest way to getvitamin D is from sunlight. The sun’s ultraviolet (紫外线的) rays react with skin cellsto produce vitamin D. But many people worry about getting skin cancer and skindamage from the sun. As a result they stay out of the sun. Also, darker-skinnedpeople produce less vitamin D than lighter-skinned people. The amount alsodecreases in older people and those living in northern areas that get lesssunlight.

Not many foods naturally contain vitamin D.Foods high in this vitamin include oily fish and fish liveroils (鱼肝油). Farmed fish have onlyabout one-fourth as much vitamin D as wild fish. Small amounts of vitamin D arefound in beef liver, cheese and egg yolks. But most of the vitamin D in theAmerican diet comes from foods such as milk.

Research in the last several years hasshown that low levels of vitamin D may increase the risk of heart attacks inmen and deaths from some cancers. More doctors are now having their patientstested for their vitamin D levels. But as research continues, some expertsworry that if people take too much vitamin D, it might act as a poison. Also,skin doctors warn people to be careful with sun exposure because of the risk ofskin cancer.

1.The first paragraph is mainly about .

2.Which of the following people produce theleast amount of vitamin D?______

3. People can get the most vitamin D from .

4.What can we infer from the text?_________

A. Being exposed to sunlight is the safestway to get vitamin D.

B. Lack of vitamin D can make people agequickly.

C. Proper vitamin D levels people need arestill not determined now.

D. The vitamin D level is higher in menthan in women.

试题答案

【答案】

1.D

2.A

3.C

4.C

【解析】

1.从第一段第一行Vitamin D helps bones and muscles grow strong and healthy维他命D使骨头和肌肉强壮，健康结合后面缺乏维他命D会导致一些疾病可得知第一段主要讲Vitamin D的功能。、

2.从第二段darker-skinned people produce less vitamin D than lighter-skinnedpeople. The amount also decreases in older people可知年老深色皮肤的人产生的Vitamin D最少。

3.从第三段Foods high in this vitamin include oily fish and fish liveroils(鱼肝油)Farmed fish.。。。found in beef liver, cheeseand egg yolks比较得出Farmedfish里Vitamin D最丰富。

4.推断题。从第二段The easiest way to get vitamin D is from sunlight可看出A答案表达错误。Ｂ答案是直接信息，不能入选，Ｄ答案未提及，故选Ｃ

考点：说明文

点评：本文讲述了Vitamin D的功能和作用及获得Vitamin D的方式，如晒太阳及吃富含Vitamin D的食物