Itisdifficultfordoctorstohelpa-优题课

American scientists have developed the first material that repairs itself. The material is a form of plastic that has been engineered to fill breaks in its surface.
Plastics are used today in everything from airplane wings to hundreds of object found in the home. Scientists wanted to find a way to make objects made of plastic last longer. The researchers hope their new discovery can be used to make objects that are difficult or impossible to replace.
The surface of plastic objects breaks over time. Very small breaks develop every time a plastic object is used. The researchers wanted to find out how to stop plastic from developing small breaks that weaken and destroy it. They found the answer in the chemical structure（构造）of plastic itself.
Plastic is made of monomers（单体）. These monomers link together to form polymers（聚合物）. Polymers give plastic its ability to be shaped and its strength. The research team found a way to make plastic that contains very small balloons filled with monomer liquid（液体）. When the new plastic cracks（裂开）, the monomer liquid is let out and flows into the crack. Thus the break is repaired. The repaired plastic has seventy – five percent of the strength of undamaged plastic.
The new self – repairing plastic is not yet ready for production. But it has several possible uses. One could be in space vehicles where parts cannot be repaired or replaced. Another possible use might be in bridges. And it could be used in people, to replace bone joints that have become broken or damaged.
72．Which of the following can be the best title for the article?
A．Ever-Lasting Material Invented.
B．The Chemical Structure of Plastic.
C．Plastic that Repairs Itself.
D．Small Balloons that Makes Plastic Stronger.
73．We know from the passage that the repair is done as .
A．the cracked plastic parts are changed
B．the plastic is made
C．the liquid is put into the plastic cracks
D．the plastic cracks
74．The scientist are planning to use the new material in space vehicles, bridges and people because .
A．the plastic parts in them are required to last longer
B．the plastic parts in them are easily broken or damaged
C．the new material cannot be used elsewhere
D．they want to experiment in these places first
75．What can we know about the new material mentioned in the passage?
A．It is a kind of liquid that is commonly used.
B．It is more difficult to make than common plastics.
C．Its surface does not crack so easily as other ones.
D．It makes it difficult or impossible to replace plastic objects.

Students must apply for a place before attending any class. Applications(申请), either by post or in person, are dealt with strictly in the order they are received at the Adult Education Office.
　　You can apply:
　　BY POST-Use the card provided with the exact fee. You'll be accepted on the course unless it is full, in which case we will inform you. An acknowledgement(承认) will not be made nor a receipt(收据) sent unless you provide a stamped addressed envelope. Receipts will normally be given out at the first class.
　　IN PERSON-Call at the Adult Education Office (ground floor, Block C) between approximately 9:00 a.m. and 3:00 p.m. (2:30 p.m. on Fridays), or at the College Reception Desk (at the main entrance) at the other times (in the evenings until about 7:30 p.m. on Fridays).
　　Students should note that popular classes may be full well before the course is to start, so that early application is strongly advised to avoid disappointment.
　　For the AUTUMN TERM, applications will be accepted by post (preferably) or in person from 1st August.
　　For the SPRING TERM, applications will be accepted from 1st December.
　　For the SUMMER TERM, applications will be accepted from 1st April.
68．Students who apply to the college by post will ________ .
　　A．avoid disappointment
　　B．be sent a bill
　　C．have an advantage over people applying in person
　　D．be informed if they haven't got a place
69．Students applying by post must ________ .
　　A．hand in a stamped addressed envelope in person
　　B．pay at the first class
　　C．bring the receipt to the first class
　　D．send payment with their application
70．Where can students apply in person?
　　A．At the College Reception Desk at 3:30 p.m.
　　B．At the Adult Education Office after about 3:30 p.m.
　　C．At the Adult Education Office at 9:30 a.m.
　　D．At the College Reception Desk at 2:20 p.m. on Fridays.
71．If students want to apply for the AUTUMN TERM, ________ .
　　A．they should check whether the course is full
　　B．they can apply by post or in person
　　C．applications must be received by August 1st
　　D．they must apply in person before August 1

Watching some children trying to catch butterflies one hot August afternoon, I was reminded of an incident in my own childhooD．When I was a boy of 12 in South Carolina, something happened to me that cured me forever of wanting to put any wild creature in a cage.
We lived on the edge of a wood, and every evening at dusk the mockingbirds would come and rest in the trees and sing. There isn’t a musical instrument made by man that can produce a more beautiful sound than the song of the mockingbird.
I decided that I would catch a young bird and keep it in a cage and in that way would have my own private musician.
I finally succeeded in catching one and put it in a cage. At first, in its fright at being captured, the bird fluttered about the cage, but eventually it settled down in its new home. I felt very pleased with myself and looked forward to some beautiful singing from my tiny musician.
I had left the cage out on our back porch, and on the second day of the bird’s captivity my new pet’s mother flew to the cage with food in her mouth. The baby bird ate everything she brought to it. I was pleased to see this. Certainly the mother knew better than I how to feed her baby.
The following morning when I went to see how my captive was doing, I discovered it on the floor of the cage, dead. I was shocked! What had happened! I had taken excellent care of my little bird, or so I thought.
Arthur Wayne, the famous ornithologist, happened to be visiting my father at the time, hearing me crying over the death of my bird, explained what had occurred. “A mother mockingbird, finding her young in a cage, will sometimes bring it poison berries. She thinks it better for her young to die than to live in captivity.”
Never since then have I caught any living creature and put it in a cage. All living creatures have a right to live free.
64．Why did the writer catch a mockingbird when he was a boy of 12?
A．He had just got a new cage. B．He liked its beautiful feather.
C．He wanted it to sing for him. D．He wanted a pet for a companion.
65．The mockingbird died because it ______.
A．was frightened to death B．ate the poisonous food its mother gave it
C．refused to eat anything D．drank the poisonous water by mistake
66．An ornithologist probably means ______.
A．a religious person B．a kind person
C．a schoolmaster D．a expert in birds
67．What is the most important lesson the writer learned from the incident?
A．Freedom is very valuable to all creatures.
B．All birds put in a cage won’t live long.
C．You should keep the birds from their mother.
D．Be careful about food you give to baby birds.

MONTREAL (Reuters) – Crossing the US-Canada border（边界）to go to church on a Sunday cost a US citizen ＄10,000 for breaking Washington’s strict new security（安全）rules.
The expensive trip to church was a surprise for Richard Albert, who lives right on the Canadian border. Like the other half-dozen people of Township 15, crossing the border is a daily occurrence for Albert. The nearby Quebec village of St. Pamphile is where they shop, eat and go to church.
There are many such situations in these areas along the largely unguarded 5,530-mile border between Canada and the US-which in some cases actually runs down the middle of streets or through buildings.
As a result, Albert says he did not expect any problems three weeks ago when he returned home to the US after attending church in Canada, as usual. The US customs（海关）station in this are is closed on Sundays, so be just drove around the locked gate, as he had done every weekend since the gate appeared last May, following a tightening of border security. Two days later. Albert was told to go to the customs office, where an officer told him be had been caught on camera crossing the border illegally（非法）.
Ottawa has given out special passes to some 300 US citizens in that area so they can enter the country when Canadian customs stations are closed, but the US stopped a similar program last May. That forces the people to a 200-mile detour along hilly roads to get home through another border checkpoint.
Albert has requested that the customs office change their decisions on the fine, but he has not attended a Sunday church since. “I feel like I’m living in a prison,” he said.
60．We learn from the text that Richard Albert is .
A．an American living in Township 15
B．a Canadian living in a Quebec village
C．a Canadian working in a customs station
D．an American working in a Canadian church
61．Albert was fined because he.
A．failed to obey traffic rules B．broke the American security rules
C．worked in St. Pamphile without a pass D．damaged the gate of the customs office
62．The underlined word “detour” in paragraph 5 means .
A．a drive through the town B．a race across the fields
C．a roundabout way of travelling D．a journey in the mountain area
63．What would be the best title for the text?
A．A Cross-country Trip B．A Special Border Pass
C．An Unguarded Border D．An Expensive Church Visit

In the world today, all of the people need recreation (消遣). We cannot work all the time if we are going to keep healthy and enjoy life.
Everyone has his own way of relaxing. Perhaps the most popular form is to take part in sports. There are team sports, such as basketball and football; There are also individual (个人的) sports, such as swimming and running. Skating and mountain climbing are the most popular recreation for people who like to be outdoor.
Not everyone who enjoys sports likes to take part in them. Many people like watching them on TV or listening to them on the radio. So many people like some forms of indoor recreation, such as watching TV, singing and dancing.
It doesn’t matter whether we like indoor recreation or take part in outdoor sports. It is important for everyone to relax from time to time, and enjoy some forms of recreation.
56．Which is the most popular form of recreation?
A．Sports. B．Watching TV.
C．Sleeping. D．Singing and dancing.
57．People want to take part in sports in order to ____.
A．keep healthy and enjoy life B．make friends
C．find a good job D．make more money
58．Outdoor sports include ____.
A．watching TV B．singing and dancing
C．listening to the radio D．skating and mountain climbing
59．The passage mainly tells us that ____.
A．basketball is a kind of team sport
B．everyone who enjoys sports should take part in them
C．different people have different ways of relaxing
D．indoor recreation is not as important as outdoor sports