题目
题型:山西省模拟题难度:来源:
a new study has confirmed that atmospheric CO2 is also affecting the ocean chemistry and potentially harming
sea life.
Montana State University scientist Robert Dore has been researching the water in the Pacific Ocean
for almost two decades.
"We"ve been going to the same spot in the Pacific Ocean, and we try and characterize long-term change
in the open ocean environment. And one of the key things that we measure is CO2 levels. And we"ve been
able to record this increasing quantity of atmospheric CO2 into the ocean."
Scientists expected that as atmospheric CO2 increased, more and more of the carbon dioxide would be
absorbed into the ocean, affecting the chemical balance of the sea water, with a potentially harmful impact
on shellfish and coral in particular.
"As carbon dioxide dissolves (溶解) in the water, or seawater in this case, it forms a weak acid (酸),
carbonic acid," Dore explains. "And therefore, as the concentration of CO2 in the atmosphere goes up and
that exchanges with the surface seawater, it drives the pH down, and makes it more acidic."
The seawater Dore and his colleagues have analyzed confirms what the theory predicts.
The effect was particular striking at about 250 meters down, and again at 500 meters. Dore and his
colleagues came up with two possible explanations. It could be that surface water picked up CO2 and then
moved to those depths. Or there could be a biological explanation.
"It"s important to realize that the oceans are really becoming acidic. And it can have negative impacts on
a whole variety of sea life from fish to coral. It"s potentially catastrophic."
B. Scientist Researching Seawater
C. Oceans Becoming More Acidic
D. Climate Change Affecting Seawater
a. Sea life is endangered.
b. CO2 goes into the surface water.
c. The ocean chemistry is affected.
d. CO2 decreases the pH and makes the seawater more acidic.
e. CO2 levels in the atmosphere go up.
B. e→b→c→d→a
C. a→e→c→d→b
D. e→d→c→b→a
B. the expectation of other scientists
C. some former theory
D. a major cause of climate change
B. Atmospheric CO2 is doing harm to sea life.
C. Robert Dore is a committed and serious scientist.
D. Measures should be taken to prevent the potential catastrophe.
答案
核心考点
试题【 Rising levels of carbon dioxide in the atmosphere are a major cause of clim】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
in the waves, or on the grassland, you should be aware that your sport of choice might have great influence
on the environment.
Some sports are resource-hungry. Golf, as you may know, eats up not only large areas of countryside,
but also tons of water. Besides, all sorts of chemicals and huge amounts of energy are used to keep its courses (球场) in good condition. This causes major environmental effects. For example, in the dry regions of Portugal
and Spain, golf is often held responsible for serious water shortage in some local areas.
There are many environment-friendly sports. Power walking is one of them that you could take up today.
You don"t need any special equipment except a good pair of shoes; and you don"t have to worry about
resources and your purse. Simple and free, power walking can also keep you fit. If you walk regularly, it
will be good for your heart and bones. Experts say that 20 minutes of power walking daily can make you
feel less anxious, sleep well and have better weight control.
Whatever sport you take up, you can make it greener by using environment-friendly equipment and buying
products made from recycled materials. But the final goal should be"green gyms". They are better
replacements for traditional health clubs and modern sports centers. Members of green gyms play sports
outdoors, in the countryside or other open spaces. There is no special requirement for you to start your
membership. And best of all, it"s free.
B. Golf runs out of much water
C. Keeping golf court in good condition needs too much energy
D. Golf is bad for people"s health
B. hiking in the hills
C. playing basketball in the gym
D. motor racing in the desert
B. it is an outdoor sport
C. it uses fewer resources
D. it is recommended by experts
B. comparison and persuasion
C. facts and descriptions
D. figures and conclusion
I love to answer questions about children"s health. Some questions and their answers become articles,
FAQ"s, Updates, Fast Facts, Top Tips, or Guidelines here on the site. I answer others in real time during
chat. Either way, here is how to submit a question.
I am available live, for one hour, every weekday. No appointments are necessary! All you have to do is
log on to chat and ask your question. In most cases, you"ll get your answer right there! Some of the
questions from chat are selected for me to write about in greater depth. Even if you don"t have time to stay
at chat, send your question to the chat host to be considered for a future article.
Please join me in chat, Monday-November 22, 2009 at 9:00 p.m.
I will be in the chat room for one hour to answer your children"s health questions. To ask your question,
please type a "?" mark on the screen. A host will call upon you when it is your turn to ask a question.
Click here to chat.
Click here to learn more about chat.
Click here for a complete chat schedule.
B. a lawyer
C. a teacher
D. an adviser
B. write to the author in advance
C. be on the line
D. make an appointment
A. The writer sometimes writes questions into an article.
B. The writer can be visited on Monday - November 22.
C. The talker has to type a"?" mark on the screen.
D. Anyone who asks questions must come to the chat room.
B. must be about children"s health questions
C. has to be called on Monday
D. will become articles to be published
But they don"t blame themselves either. Instead, they try to understand the negative thoughts and
feelings and counter (反击) them with more positive ones.
So how do you stay positive, maintain motivated and sustain (保持) healthy behaviors? Here are
some tips:
Look for a good role model. There is always someone who seems to be doing just what you want
to be doing. Maybe they"ve scheduled exercise into their workday and switched from coffee to green tea.
Learn from a successful friend, family member or colleague. Ask them how they keep healthy and follow
in their footsteps.
Try some positive self-talk and avoid negative-talk. Take a minute to give yourself an ego boost. Repeat
some motivational words out loud to yourself. Negative talk such as"I can"t do it," "I"m fat," is dangerous
for your well-being and healthy goals. Try to avoid the negative self-talk before it harms you. Remind
yourself that you deserve happiness and can make positive changes.
Get support. Tell your friends and family about your healthy habits. It helps to have an encouraging
network.
Reward yourself. Treat yourself to something for your healthy efforts. Take a nice bath, get a massage,
and enjoy a new DVD or CD.
Have a plan. Making a plan to exercise or eat healthy lunches with a friend can mean the difference of
sticking with your goals or falling off track. If you"ve planned for an activity, you"ll likely stick with it.
You may even find that writing down your goals and steps to achieve them can help you stay on track.
Take it day by day or week by week. The process of writing down your personal action plan is a good
way to keep you honest and watch your progress or failures.
B. persuade readers to learn from a role model
C. provide some solutions to personal problems
D. inform readers of some tips on physical health
B. to think about the hardships.
C. to check what mistake you made.
D. to make you feel better about yourself.
B. By staying with your companion you can avoid the negative-talk.
C. A successful friend, relative or colleague can be your role model.
D. Creating a helpful network is a good way to keep you motivated.
B. Relax yourself after a hard day.
C. Write down what you want to achieve
D. Modify your plans as often as you can.
and drink alcohol in a proper amount. That is according to a study published this Monday in the Public
Library of Science Medicine Journal.
After tracking more than 20,000 people aged 45-79 years in the United Kingdom from about
1993-2007, Kay-Tee, Khaw of the University of Cambridge and his colleagues found that people who
adopted these four healthy habits lived an average of 14 years longer than those who didn"t.
"We"ve known for a long time that these behaviors are good things to do, but we"ve not seen this
benefit before," said Susan Jebb, head of Nutrition and Health at Britain"s Medical Research Council."The
benefit was also seen regardless of whether or not people were fat and what social class they came from."
Study participants (参与者) scored a point each for not smoking, regular physical activity, eating five
servings of fruits and vegetables a day and moderate alcohol intake.
Public health experts said they hoped the study would inspire governments to introduce policies helping
people to adopt these changes. But because the study only observed people rather than testing specific
changes, it would be impossible to conclude that people who suddenly adopted these healthy behaviours
would surely gain 14 years.
"We can"t say that any person could gain 14 years by doing these things," said Doctor Tim Armstrong,
a physical activity expert at the World Health Organization." The 14 years is an average across the
population of what"s theoretically (理论上) possible."
"Most people know that things like a good diet matter and that smoking is not good for them", Susan
Jebb said,"We need to work on providing people with much more practical support to help them change."
B. Doing proper exercise in the morning every day.
C. Having a cigarette before going to bed every day.
D. Drinking alcohol in the proper amount every day.
B. Susan Jebb did not take part in the study
C. there is no need for people under 45 adopt these good habits
D. only those from first class can benefit from these healthy behaviours
B. People aged 45-79 have bad habits in the United Kingdom.
C. All the people are well aware of the harm of their bad habits.
D. People have adopted the four healthy habits after knowing they"re good.
B. Healthy Habits Could Gain You Extra 14 years
C. A New Way of Keeping Healthy
D. Smoking and Drinking Harms Your Health
forefathers had lived in the same way for centuries.
Then one day, some visitors from the city arrived. They told the villagers there were some people
elsewhere who liked to eat frog"s legs. However, they did not have enough frogs of their own, and so
they wanted to buy frogs from other places.
This seemed like money for nothing. There were millions of frogs in the fields around, and they were
no use to the villagers. All they had to do was catch them. Agreement was reached, and the children were
sent into the fields to catch frogs. Every week a truck arrived to collect the catch and hand over the money.
For the first time, the people were able to dream of a better future. But the dream didn"t last long.
The change was hardly noticed at first, but it seemed as if the crops were not doing so well. More
worrying was that the children fell ill more often, and, there seemed to be more insects around lately.
The villagers decided that they couldn"t just wait to see the crops failing and the children getting weak.
They would have to use the money earned to buy pesticides (***虫剂) and medicines. Soon there was no
money left.
Then the people realized what was happening. It was the frog. They hadn"t been useless. They had been
doing an important job-eating insects. Now with so many frogs killed, the insects were increasing more
rapidly. They were damaging the crops and spreading diseases.
Now, the people are still poor. But in the evenings they sit in the village square and listen to sounds of
insects and frogs. These sounds of the night now have a much deeper meaning.
B. dreamed of having a better life
C. were poor but somewhat content
D. lived a different life from their forefathers
B. They needed money to buy medicine.
C. They wanted to please the visitors.
D. The frogs made too much noise.
B. There were too many insects.
C. The visitors brought in diseases.
D. The pesticides were overused.
B. Health is more important than money.
C. The harmony between man and nature is important.
D. Good old days will never be forgotten.
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