CanstormsinAfricacauseasthma(哮-优题课

Domestic （驯养的） horses now pull ploughs, race in the Kentucky Derby, and carry police．But early horses weren’t tame （驯服的） enough to perform these kinds of tasks．Scientists think the first interactions humans had with horses were far different from those today.
Thousands of years ago, people killed the wild horses that lived around them for food．Over time, people began to catch the animals and raise them．This was the first step in domestication.
As people began to tame and ride horses, they chose to keep those animals that had more desirable characteristics．For example, people may have chosen to keep horses that had a gentle personality so they could be ridden more easily．People who used horses to pull heavy loads would have chosen to keep stronger animals．Characteristics like strength are partly controlled by the animals’ genes．So as the domesticated horses reproduced, they passed the characteristics on to their young．Each new generation of horses would show more of these chosen characteristics.
Modern-day horse breeds（种类） come in a wide variety of shapes and sizes．This variety didn’t exist in the horse population before domestication．The Shetland horse is one of the smallest breeds— typically reaching only one meter tall．With short, strong legs, the animals were bred to pull coal out of mine shafts （矿井） with low ceilings．Huge horses like the Clydesdale came on the scene around 1700．People bred these heavy, tall horses to pull large vehicles used for carrying heavy loads.
The domestication of horses has had great effects on societies．For example, horses were important tools in the advancement of modern agriculture．Using them to pull ploughs and carry heavy loads allowed people to farm more efficiently．Before they were able to ride horses, humans had to cross land on foot．Riding horses allowed people to travel far greater distance in much less time．That encouraged populations living in different areas to interact with one another．The new form of rapid transportation helped cultures spread around the world.
65．Before domestication horses were ______.
A．caught for sports B．hunted for food
C．made to pull ploughs D．used to carry people
66．The author uses the Shetland horse as an example to show ______.
A．it is smaller than the Clydesdale horse
B．horses used to have gentle personalities
C．some horses have better shapes than others
D．horses were of less variety before domestication
67．Horses contributed to the spread of culture by ______.
A．carrying heavy loads B．changing farming methods
C．serving as a means of transport D．advancing agriculture in different areas
68．The passage is mainly about _______.
A．why humans domesticated horses
B．how humans and horses needed each other
C．why horses came in different shapes and sizes
D．how human societies and horses influenced each other

第二部分阅读理解（共20小题。每小题2分，；满分40分）
阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Margaret, married with two small children, has been working for the last seven years as a night cleaner, cleaning offices in a big building.
She trained as a nurse, but had to give it up when her elder child became seriously ill．“I would have liked to go back to it, but the shifts（工作班次）are all wrong for me, as I have to be home to get the children up and off to school.”
So she works as a cleaner instead, from 9 p.m．till 6 a.m．five nights a week for just ￡90, before tax and insurance．“It’s better than it was last year, but I still think that people who work ‘unsocial hours’ should get a bit extra.”
The hours she’s chosen to work mean that she sees plenty of the children, but very little of her husband．However, she doesn’t think that puts any pressure on their relationship.
Her work isn’t physically very hard, but it’s not exactly pleasant, either．“I do get angry with people who leave their offices like a place for raising pigs．If they realized people like me have to do it, perhaps they’d be a bit more careful.”
The fact that she’s working all night doesn’t worry Margaret at all．Unlike some dark buildings at night, the building where she works is fully lit, and the women work in groups of three．“Since I’ve got to be here, I try to enjoy myself—— and I usually do, because of the other girls．We all have a good laugh, so the time never drags.”
Another challenge Margaret has to face is the reaction of other people when she tells them what she does for a living．“They think you’re a cleaner because you don’t know how to read and write,” said Margaret, “I used to think what my parents would say if they knew what I’d been doing, but I don’t think that way any more．I don’t dislike the work though I can’t say I’m mad about it.”
61．Margaret quit her job as a nurse because _______.
A．she wanted to earn more money to support her family
B．she had suffered a lot of mental pressure
C．she needed the right time to look after her children
D．she felt tired of taking care of patients
62．Margaret gets angry with people who work in the office because _______.
A．they never clean their offices B．they look down upon cleaners
C．they never do their work carefully D．they always make a mess in their offices
63．When at work, Margaret feels _______.
A．light-hearted because of her fellow workers
B．happy because the building is fully lit
C．tired because of the heavy workload
D．bored because time passes slowly
64．The underlined part in the last paragraph implies that Margaret’s parents would _______.
A．help care for her children B．regret what they had said
C．show sympathy for her D．feel disappointed in her

“The world's oceans are slowly getting more acidic(酸的),” say scientists. The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere.
The lowering of the waters' PH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century.
These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. “This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere,” said Dr Caldeira. And we predict the amount of future acidity will be greater than anything we have seen over the last several hundred million years.
However, it is not absolutely clear what that means for ocean life. Most organisms live near the surface, where the greatest PH change would be expected to occur, but deep－ocean life forms may be more sensitive to PH changes. Coral reefs and other organisms whose shells contain calcium carbonate(碳酸钙) may be particularly affected if the water's acidity levels keep going up, the team predict. They could find it much more difficult to build these structures in water with a lower PH.
In recent years some people have suggested storing carbon dioxide from power station in the deep ocean as a way of dealing with global warming. But Dr Caldeira said that such a strategy should now be re—considered. “Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing——because in releasing CO2 into the atmosphere we warm the planet, and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.”
67. The ocean is becoming more acidic due to___________.
A. the lower water PH value B. the warming atmosphere
C. the higher level of CO2 in the air D. the increasing use of oil fuels
68. According to Dr Caldeira, ___________.
A. ocean absorption of carbon dioxide is a good thing
B. more oil fuels will be used in the near future
C. scientists may predict climate changes with computer models
D. the future situation of the amount of acidity is extremely serious
69. If the water's acidity level keeps rising, ___________.
A. ocean life whose structures contain calcium carbonate may be affected
B. the water's PH value will become higher and higher
C. organisms living near the surface are more sensitive to PH changes
D. some disastrous events will occur more often than before
70. Most experts once believed storing carbon dioxide in the ocean would reduce___________.
A. the CO2 absorbed by the ocean B. the amount of greenhouse warming
C. the acidity of the ocean D. the gradual release of CO2

Sadness is unpleasant, and in a society where personal happiness is prized above all else, there is little tolerance for falling in despair. Especially now we’ve got drugs for getting rid of sad feelings — whether it’s after losing a job, the break-up of a relationship or the death of a loved one. So it’s no surprise that more and more people are taking them.
But is this really such a good idea? A growing number of voices from the world of mental health research are saying it isn’t. They fear that the increasing tendency to treat normal sadness as a disease is playing fast and loose. Sadness, they argue, serves a useful purpose—and if we lose it, we lose out. Yet many psychiatrists insist not. Sadness has a unpleasant habit of turning into depression they warn. Even when people are sad for good reason, they should take drugs to make themselves feel better.
So who is right? Is sadness something we cannot live without or something horrible never to touch? There are lots of ideas about why feeling sad should become part of human life. It may be a kind of self-protection, as other primates (灵长类) also show signs of sadness. A losing monkey that doesn’t show sadness after it loses a fight may be seen as continuing to challenge the winning monkey — and that could result in death.
In humans sadness has a further function: we may display sadness as a form of communication. By acting sad, we tell other community members that we need support.
Then there is the idea that creativity is connected to dark moods. There are plenty of great artists, writers and musicians who have suffered from depression or disorder. Scientists found that people with signs of depression performed better at a creative task, and negative moods make people think deeply over the unhappy experience, which allows creative processes to come to the front. There is also evidence that too much happiness can be bad for your career. A doctor found that people who scored 8 out of 10 on a happiness test were more successful in income and education than 9s or 10s. The happiest people lose their willingness to make changes to their lives that may benefit them.
63. The underlined word “this” refers to ________.
A. taking medicine B. falling in despair
C. losing a job D. feeling sad
64. The author believes sadness is ________.
A. a good thing for people’s health B. something horrible never to touch
C. a necessary function of humans D. always to be treated as depression
65. Some animals show their sadness in order to ________.
A. cheat their enemy B. protect themselves
C. comfort the loser D. challenge the winner
66. We can infer from the last paragraph that ________.
A. people with great creativity tend to be happier
B. unhappy experiences contribute to a greater career
C. too much happiness can be bad for your career
D. the happiest people are the most successful ones

In modern society, it is necessary for middle school students to take part in academic activities and enrich their knowledge. There are many academic clubs that students can participate in. Students can choose clubs that focus on an area of interest.
Mathcounts Club
Mathcounts tries to increase excitement towards mathematic achievement. It hopes to provide students with the foundation for success in science, technology, engineering and mathematics careers. Schools select individuals and teams to participate in competitions. Local competitions are held in February with winners progressing to state competitions and then on to the national level. Mathcounts works to challenge student math skills, develop self-confidence and give rewards for their achievements.
Envirothon
The Envirothon program focuses on natural resources knowledge and exposes students to diverse environmental issues, ecosystems, and topography. The ecology field competition for five-member middle school teams offers competitions in wildlife, soils, forestry, current environmental issues and aquatics. Students work and learn in middle school clubs and can compete at the local and state level.
Future Problem Solvers
Future Problem Solvers is an academic club that uses a six-step process to solve problems that may happen in the future. Students who are in the talented and gifted program, who like to “think out of the box,” or who enjoy thinking about futuristic problems may like this club. Teams comprised of four students read future scenes and write up solutions in a booklet using the six-step process. Teams that score high enough can go to the state competition and then to the international competition.
Builders Club
Builders Club is open to any middle school student who wishes to perform community service. Each Builders Club is co-sponsored by a Kiwanis club and the middle school. The members learn by doing, and they learn organization, teamwork, and leadership. Builders Clubs can sponsor a "Teacher of the Year" program, provide a recycling collection point, organize canned food and clothing drives to support local shelters, adopt a resident at a local senior citizens home, adopt a highway, tutor, etc.
Middle school academic clubs offer students a place to explore interests or talents. The clubs that join in middle school can help guide choices in high school and beyond.
59. The students who are not interested in competitions would like to choose___________.
A. Mathecounts Club B. Builders Club
C. Future Problem Solvers D. Envirothon
60. Why do some of the students choose Mathcounts Club?
A. To be successful in science careers.
B. To enjoy solving future problems.
C. To perform community service.
D. To study wildlife and soils.
61. What is the common feature of the four clubs?
A. Competitions B. Sponsorship
C. Scientific researches D. Teamwork.
62. The passage mainly talks about___________.
A. the state academic competitions B. middle school clubs
C. extra – curricular activities D. the gifted students

A．Dangerous Dust	B．Dangerous Disease
C．Changing Weather	D．Developing Technology