Sweet potatoes are fat-free,high in fiber and full of the vitamins that research suggests reduce your risk of life-shortening diseases．To stay healthy,we must eat more fruits and vegetables,and sweet potatoes are a great source of beta carotene（胡蘿卜素）and other carotenoids．According to a study of the diets of almost 90,000 nurses,eating about one cup a day of fruils and vegetables rich in carotenoids(which the body turns into vitamin A)can cut your risk of stroke in halt and reduce your risk of heart disease by 22 percent．Other resear chsuggests beta carotene protects against breast,lung and stomach cancers．

　　Beta carotene is the most famous member of the carotenoids family．In fact,a medium sized sweet potato contains nearly 12 mg of beta carotene(antiaging experts usually suggest 6 to 11 mg perday)．Sweet potatoes are also a low-fat source of vitamin E．Research has linked high E diets with a lower risk of heart disease．This vitamin pill in an orange jacket also packs a vitamin C punch-it has more C than apricots(a kind of fruit)．Research suggests that vitamin C protects against ailments ranging from cataracts(an eye disease)to cancer．In addition,A UCLA(University of California,Los Angels)study linked high vitamin C diets with a longer life．Recent studies have showed that antioxidant vitamins C,E and beta carotene fight a fierce battle against free radicals（自由基）,which cause cell（細(xì)胞）damage and lead to various illnesses．Therefore,to keep fit,eat more sweet potatoes．

(1)

According to the text,there exists a lot of ________ in sweet potatoes．

[　　]

A．

fiber,beta carotene,other earotenoids,vitamin E and C

B．

beta carotene,other carotenoids,fiber,vitamin A and E

C．

vitamin A,beta carotene,fiber,vitamin E and C

D．

beta carotent,other carotenoids,vitamin A and E

(2)

This text as a whole suggests that eating sweet potatoes can help ________

[　　]

A．

cut your risk of stroke and heart disease

B．

protect against breast,lung and stomach cancers

C．

protect against ailments ranging from cataracts to cancer

D．

you stay healthy and reduce your risk of life shortening diseases

(3)

“This vitamin pill in an orange jacket”in the passage refers to ________

[　　]

A．

sweet potato

B．

vitamin C pill

C．

vitamin E pill

D．

beta carotene

(4)

The best title of this passage might be ________

[　　]

A．

The Vitamin Superstar

B．

On Sweet Potatoes

C．

Beta Carotene and Vitamins

D．

Diet and Disease

答案：1．A;2．A;3．A;4．A;
解析：

(1)

由文章第一段，第二段可知。

(2)

由文章第一段，第二段可知。

(3)

文章通篇介紹的都是紅薯。

(4)

因?yàn)榧t薯富含維生素，所以稱它為維生素超級(jí)明星一點(diǎn)都不過(guò)分。


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科目：高中英語(yǔ) 來(lái)源：2011年普通高等學(xué)校招生全國(guó)統(tǒng)一考試英語(yǔ)試題北京卷 題型：050

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　　I love my blackberry－it’s my little connection to the larger world that can go anywhere with me．I also love my laptop computer ，as it holds all of my writing and thoughts．Despite this love of technology, I know that there are times when I need to move away from these devices(設(shè)備)and truly communicat with others．

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　　I love my blackberry—it’s my little connection to the larger world that can go anywhere with me. I also love my laptop computer，as it holds all of my writing and thoughts. Despite this love of technology, I know that there are times when I need to move away from these devices(設(shè)備) and truly communicate with others.

　　On occasion, I teach a course called History Matters for a group of higher education managers. My goals for the class include a full discussion of historical themes and ideas. Because I want students to thoroughly study the material and exchange their ideas with each other in the classroom, I have a rule —no laptop, iPads, phones, etc. When students were told my rule in advance of the class, some of them were not happy.

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　　I’ve been teaching my history class in this way for many years and the evaluations reflect student satisfaction with the environment that I create. Students realize that with deep conversation and challenge, they learn at a level that helps them keep the course material beyond the classroom.

　　I’m not saying that I won’t ever change my mind about technology use in my history class, but until I hear a really good reason for the change, I’m sticking to my plan. A few hours of technology-free dialogue is just too sweet to give up.

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A．the course material                      B．the author’s class regulations

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B．encourage students to have in-depth conversations

C．help students to better understand complex themes

D．a(chǎn)ffect students’ concentration on course evaluation

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A．is quite stubborn

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C．values technology-free dialogues in his class

D．will change his teaching plan soon

 

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