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(果蝇), as they share many genes(基因)with humans．The fruit flies were either fed normally or had an apple extract(浓缩物)added to their diet．
It turned out that those fruit flies that were given apple extract lived about 55 days－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(抗氧化剂)in the apple extract helped clean up dangerous chemicals(化学物质)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 20 percent less likely to suffer heart illnesses and stroke．
The apples' genetic code(遗传密码)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 100 scientists from five countries．Their research also suggests that around 65 million 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．
(1)
Why were fruit flies used for the research?
[ ]
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．
(2)
What result did the researchers find out?
[ ]
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．
(3)
What happened to apples around 65 million years ago according to the research?
[ ]
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．
(4)
What can we infer(推断)from the passage?
[ ]
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．
Good afternoon.Welcome to England.We hope that your visit will be a pleasant one.Today I'd like to tell you something about a few of our laws.
The first one is about drinking.Now you may not buy wine in this country if you are under 18 years of age,nor may your friends buy it for you.
The second one,noise.Enjoy yourselves by yourself,but don't make unnecessary noise,especially at night.We ask you to respect other people who may wish you be quiet.
The third one,crossing the road.Be careful.The traffic moves on the left side of the road in this country.Use pedestrian crossing (人行横道) and don't take any chances when crossing the road.
My next point is about rubbish.It isn't lawful to drop rubbish in the street.When you have something to throw away,please put it in your pocket and take it home,or put it in a dustbin.
Finally,smoking.It is against the law to buy cigarettes if you are less than 16 years of age.
I'd like to finish by saying that if you need any kinds of help,you should contact the police.They will be glad to help you.You can call,write or go to ask any policemen.
(1)
Who do you think is most likely to make the speech?
A.A guide. B.A person who makes laws.
C.A teacher. D.An English officer.
[ ]
(2)
How many laws are discussed in the speech?
A.Four. B.Three. C.Six. D.Five.
[ ]
(3)
The main purpose (目的) of this speech is to ______.
A.tell people that those above 18 can drink and smoke in England
B.declare (宣布) the different laws in England
C.give advice to the travelers in England
D.warn people against going to England
[ ]
(4)
The underlined word“contact”in the last paragraph means“______”.
A.keep up B.go to see C.make a call to D.bring trouble
[ ]
(5)
From the passage we can learn______.
A.in England,if you are under 18 years of age,you can't buy wine,but your friends can buy it for you
B.you may not buy cigarettes unless you are above 16 years of age
C.because the traffic moves on the left side of the road,you must use the pedestrian crossing when crossing the road
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