6.In the dead of winter,we don't typically think about spending time outdoors,but according to many physicians we should.The sun is our greatest source of a vitamin that is essential for good health-Vitamin D.
This important vitamin strengthens bones and teeth and is linked to the prevention of heart disease,cancer and many other life-threatening diseases.The recommended daily requirement is 400-600 International Units (IU).In summer,people with dark brown eyes and darker skin turn sunlight from just 15 minutes outside without sunscreen into adequate amounts of Vitamin D.
Even during winter,just a 10-minute walk midday can keep the body's Vitamin D at healthy levels.During brief winter walks,we receive the greatest benefits when we wear no sunscreen and expose as much skin to the sun as possible.
Vitamin D can also be obtained from foods.Salmon is one of the best sources of the Vitamin.Egg yolks(蛋黃),cheese,mushrooms and some animals organs contain smaller quantities of it.
To attract consumers,food companies add Vitamin D to some of their milk products.The practice of putting the Vitamin into milk began in the 1930s.At that time,many children were suffering from rickets,an illness that is caused by a Vitamin D deficiency(不足).It made the children's bones soft and weak.Adding Vitamin D to milk helped to solve the problem,and it has been available ever since.
For people who still need more Vitamin D,there is another option:take Vitamin D supplements(補充).These products are widely sold in stores.However,anyone considering taking supplements should consult a physician first.

4.During the winter months,peopleC.
A.a(chǎn)ren't able to meet their deadlines
B.often don't dress warmly enough
C.generally like to remain indoors
D.leave lots of work for others to do
5.According to the text,Vitamin DA.
A.can be obtained by being exposed to the sun
B.can be used to cure life-threatening diseases
C.can be mainly found in some milk products
D.can make the children's bones soft and weak
6.Why is salmon mentioned in this article?B
A.It's seldom prepared in the correct way.
B.It's a useful addition to a person's diet.
C.It has a huge impact on the environment.
D.Its advantages have been exaggerated.
7.The main purpose of this article isA.
A.to introduce a valuable nutrient
B.to advertise Vitamin D supplements
C.to note risks associated with a nutrient
D.to explain how a nutrient was discovered.

分析 本文通過各種途徑來介紹人們可以獲得維生素D,可見寫作的目的是向人們介紹有價值的營養(yǎng).

解答 4.C 細節(jié)理解題.根據(jù)句子In the dead of winter,we don't typically think about spending time outdoors在冬天,我們通常不會想到在戶外消磨時間.
5.A 細節(jié)理解題.根據(jù)句子The sun is our greatest source of a vitamin that is essential for good health-Vitamin D.太陽是我們健康維生素D必不可少的維生素的最大來源.所以答案選A.
6.B細節(jié)理解題.根據(jù)句子Vitamin D can also be obtained from foods.Salmon is one of the best sources of the Vitamin.維生素D也可以從食物中獲。q魚是維生素的最佳來源之一.所以答案選B.
7.A 寫作意圖題.本文通過各種途徑來介紹人們可以獲得維生素D,可見寫作的目的是向人們介紹有價值的營養(yǎng),所以答案選A.

點評 本文考查細節(jié)題為主,細節(jié)題可以在文章中直接找到與答案有關(guān)的信息?或是其變體.搜查信息在閱讀中非常重要它包括理解作者在敘述某事時使用的具體事實、數(shù)據(jù)、圖表等細節(jié)信息.在一篇短文里大部分篇幅都屬于這類圍繞主體展開的細節(jié).做這類題一般采用尋讀法?即先讀題,然后帶著問題快速閱讀短文,找出與問題有關(guān)的詞語或句子,再對相關(guān)部分進行分析對比,找出答案.

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