2.You are probably familiar with the saying:An apple a day keeps the doctor away.A recent research carried out by the Chinese University of Hong Kong may change the saying:An apple a day may keep aging away.
The research chose fruit flies(果蠅),as they share many genes(基因) with humans.The fruit flies were either fed normally or had an apple extract(濃縮物) added to their diet.
It turned out that those fruit flies that were given apple extract lived about 55days-five days longer than the flies that were normally fed.The research group also found it easier for the flies to walk,climb and move about as they aged.
According to the result,the researchers believed that the antioxidants(抗氧化劑) in the apple extract helped clean up dangerous chemicals(化學(xué)物質(zhì)) that cause illnesses,as well as aging.
In another study,researchers examined diets of thousands of women.They discovered that those who regularly ate apples were 20percent less likely to suffer heart illnesses and stroke.
The apples'genetic code (欲望) was discovered recently.It allows scientists to develop nicer and healthier fruits.Researchers are already using the information to grow a kind of apples full of antioxidants that can keep eyes and joints healthy and protect humans against heart illnesses and cancer.
Apples that kill the desire(欲望) to eat could also be produced,with the first"extra-healthy"apples on supermarket shelves within just four or five years.
The team that keeps studying apple DNA includes 100scientists from five countries.Their research also suggests that around 65million years ago,when dinosaurs began to die off,the plant,which would finally become today's apple tree,experienced a great genetic change.The number of many of its genes doubled.The extra genes allowed the apple to get used to worse conditions and go through a different development from peaches,strawberries and other related fruits.

30.Why were fruit flies used for the research?C
A.Because they have a similar diet to humans.
B.Because they have a history as long as apples.
C.Because they share a lot of genes with humans.
D.Because they feed on nothing but apple extract.
31.What result did the researchers find out?B
A.Apples produce chemicals that can change human genes.
B.Apples have antioxidants that kill chemicals that cause aging.
C.Apples are rich in vitamins that are needed in humans'bodies.
D.Apples produce chemicals that make apples taste more delicious.
32.What happened to apples around 65million years ago according to the research?
C
A.Their genes stopped their development as the environment got worse.
B.Their genes became twice in number but they finally died off like dinosaurs.
C.They experienced a great genetic change making them used to worse conditions.
D.They went through a similar development to peaches,strawberries and other related fruits.
33.What can we infer(推斷) from the passage?A
A.Eating apples may bring us more advantages than we might believe before.
B.People who have the habit of eating apples don't need to see a doctor.
C.Apples that kill the desire to eat are already available in supermarkets now.
D.People will eat apples instead of peaches and strawberries from now on.

分析 一天一個蘋果,疾病遠離我,可最近一項研究表明,一天一個蘋果,有助于抗老化.
此報告專注于研究果蠅,因為其一部分基因和人類的一樣.這些果蠅有的是正常喂養(yǎng),有的是正常喂養(yǎng)的基礎(chǔ)上加入了蘋果濃縮物.
最后證明加了蘋果濃縮物的蘋果生命持久的要長5天,還發(fā)現(xiàn)果蠅活動更靈活.
根據(jù)結(jié)果可知蘋果濃縮物里的抗氧化劑能清除引起疾病和衰老的化學(xué)物質(zhì).
另一個研究發(fā)現(xiàn)那些經(jīng)常吃蘋果的女人患心臟病和中風的可能性要低20%.蘋果的遺傳密碼已被發(fā)現(xiàn),專家正在種植含有抗氧化劑的蘋果.研究蘋果DNA的專家來自5個國家的100個科學(xué)家,他們的研究還表明,在6500萬年前,當恐龍開始死亡,植物,最終成為今天的蘋果樹,經(jīng)歷了一個偉大的遺傳變化.它的許多基因的數(shù)量增加了一倍,額外的基因讓蘋果適應(yīng)惡劣條件和不同的發(fā)展經(jīng)歷了,從桃子草莓和其他水果.

解答 30.C.細節(jié)理解題,根據(jù)第二段The research chose fruit flies(果蠅),as they share many genes(基因)with humans.可以看出此報告專注于研究果蠅,因為其一部分基因和人類的一樣,故選C.
31.B.細節(jié)理解題.根據(jù)第三段"According to the result,the researchers believed that the antioxidants(抗氧化劑) in the apple extract helped clean up dangerous chemicals(化學(xué)物質(zhì)) that cause illnesses,as well as aging."可知蘋果濃縮物里的抗氧化劑能清除引起疾病和衰老的化學(xué)物質(zhì).故選B.
32.C.推理判斷題,根據(jù)最后"when dinosaurs began to die off the plant,which would finally become today's apple tree,experienced a great genetic change."在6500萬年前,當恐龍開始死亡,植物,最終成為今天的蘋果樹,經(jīng)歷了一個偉大的遺傳變化.The extra genes allowed the apple to get used to worse conditions 額外的基因讓蘋果適應(yīng)惡劣條件,故選C.
33.A.推理判斷題.根據(jù)第一段:An apple a day keeps the doctor away.A recent research carried out by the Chinese University of Hong Kong may change the saying:An apple a day may keep aging away.吃蘋果會給我們帶來更多的優(yōu)點比我們之前認為的更多,可以抗衰老,故答案是A.

點評 在答題時,一定不要急于去選擇,要看清楚題目,看清題目說的是什么,問的是什么.

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