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题型:阅读理解-阅读单选 难度:0.4 引用次数:115 题号:9564646

Is Your Diet Destroying the Environment?

A vegetarian diet is often praised for its health benefits. Studies have shown that vegetarians usually have lower levels of heart disease and a lower risk of diabetes than people who eat meat. What most people are less aware of, however, are the effects that a vegetarian diet can have on the environment.

Researchers from the Union of Concerned Scientists in the US recently studied how consumer behavior affects the environment. The study showed that meat consumption is one of the main ways that humans can damage the environment, second only to the use of motor vehicle.

Then, how can eating meat have a negative effect on the environment? For a start, all farm animals such as cows, pigs, and sheep give off methane (沼气) gas by expelling (排出) wind from their bodies. One cow can produce up to 60 liters of methane each day. Methane gas is the second most common greenhouse gas after carbon dioxide. Many environmental experts now believe that it is more responsible for global warming than carbon dioxide. It is estimated that 25% of all methane released into the atmosphere comes from farm animals.

Another way that meat production affects the environment is through the use of water and land. 2,500 gallons of water are needed to produce one pound of beef, whereas 20 gallons of water are needed to produce one pound of wheat. One acre of farmland used for crop production can produce 40,000 pounds of potatoes, 30,000 pounds of carrots, or 50,000 pounds of tomatoes.

Many people now see the benefits of switching to a vegetarian diet, not just for health reasons, but also because it plays a vital role in protecting the environment. However, some nutritionists advise against switching to a totally strict vegetarian, or vegan diet. They believe a vegan diet, which excludes all products from animal sources, such as cheese, eggs, and milk, can be short of many necessary vitamins and minerals our bodies need.

Today, many people know it’s important to take better care of their bodies and to use the earth’s resources more efficiently. As this understanding spreads, more people may realize that to help the environment and for the human race to survive, more of us will need to become vegetarians.

1. The underlined word “it” in Para.3 refers to ___________.
A.methane gasB.carbon dioxide
C.expelling windD.greenhouse gas
2. Many figures are used in Para.4 to show ___________.
A.growing tomatoes has the highest production
B.crop production is better than meat production
C.meat production consumes too much water and land
D.farm animals are the main producer of the methane gas
3. What message does the passage want to convey?
A.Our diet is destroying the surroundings.
B.Raising farm animals affects the environment.
C.A vegetarian diet helps to protect the environment.
D.More and more people are becoming strict vegetarians.

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【推荐1】Why do people drink too much, eat too much, smoke cigarettes or take drugs? What’s to blame for all the bad behavior? Most people would say that, while these self-destructive acts can have many root causes, they all have one obvious thing in common: they are all examples of failures of self-control, lacking the will power to resist them.
According to a recent study, however, if you really think about it, something about that simple answer doesn’t quite make sense. In fact, it turns out that sometimes it’s having will power that really gets you into trouble.
Think back to the time you took your very first sip (啜饮) of beer. Disgusting, wasn’t it? When my father gave me my first taste of beer as a teenager, I wondered why anyone would voluntarily drink it. And smoking? No one enjoys their first cigarette — it tastes awful. So even though smoking, and drinking alcohol or coffee, can become temptation (诱惑) you need will power to resist, they never, ever start out that way.
Just getting past those first horrible experiences actually requires a lot of self-control. Ironically (讽刺的是), only those who can control themselves well, rather than give in to them, can ever come to someday develop a “taste” for Budweiser beer, Marlboro cigarettes, or dark-roasted Starbucks coffee. We do it for social acceptance. We force ourselves to consume alcohol, cigarettes, coffee and even illegal drugs, in order to seem experienced, grown-up, and cool.
These bad habits aren’t self-control failures — far from it. They are voluntary choices, and they are in fact self-control successes. Self-control is simply a tool to be put to some use, helpful or harmful. To live happy and productive lives, we need to develop not only our self-control, but also the wisdom to make good decisions about when and where to apply it.
1. What do most people think causes bad behavior?
A.Being forced by others.
B.Not having enough will power.
C.Enjoying their first experiences.
D.Following the examples of their friends.
2. The author mentions his experience in the third paragraph to prove ____.
A.will power helps develop bad habits sometimes
B.drinking beer is harmful to the health of teenagers
C.self-control should be developed when one is young
D.everyone can be challenged by different temptations
3. In the last paragraph, the author stresses that ____.
A.without self-control, no one can succeed
B.bad habits don’t always lead to bad results
C.applying self-control correctly is important
D.people can develop wisdom from bad behavior
4. What would be the best title for the passage?
A.My First Sip of BeerB.Do You Have Will Power ?
C.Does Will Power Benefit Us?D.Dark Side of Self-control
2016-11-25更新 | 1080次组卷
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【推荐2】Researchers have found that cutting up children's food rather than giving them meals where they have to bite with their front teeth makes them better behaved at the dinner table.

Foods that children have to pick up and bite into using their front teeth — such as chicken or whole apples — encourage aggressive(攻击性的) behaviour, scientists at Cornell University have found.

Children eating chicken on the bone were twice as aggressive as those given the same chicken cut into pieces, the study reports. Those eating on-the-bone chicken also ignored(忽视)adults' instructions more than twice as often and displayed much worse dinnertime behaviour — such as standing on the table or jumping off chairs.

This is thought to be an example of so-called"facial feedback(面部反馈)", where using certain facial muscles improves particular emotions.

Facial feedback from smiling is well known. People holding a pencil between their nose and upper lip — preventing smiling — consider a cartoon far less interesting than those forced to smile by holding the pencil between their teeth.

In the case of eating, foods such as on-the-bone chicken, boiled corn and whole apples require the front teeth to be used for biting.

Showing the front teeth uses the same facial muscle as the one that is used to show aggression, and the feedback may immediately increase aggressive behaviour. Showing the front teeth is a common sign of aggression in the animal world. Being surrounded by bare (呲开的) teeth may make a child feel under threat, further increasing their aggression. As children have less self-control, they are more influenced by facial feedback than adults.

This small study, named Eating Behaviors, looked at six to ten year olds, but the same effects are expected in both older and younger children. The advice from study leader, Professor Brian Wansink, is simple: “If you want a nice, quiet, relaxing meal with your kids, cut up their food.”

1. Why is it good for children to have food cut up?
A.They will eat more.
B.They behave better at the table.
C.They will have healthy teeth.
D.They are happy eaters.
2. What may children eating on-the-bone chicken do?
A.Become less aggressive.
B.Stand on the table.
C.Keep seated on the chairs.
D.Throw the bones.
3. Children with a pencil between their nose and upper lip will think cartoons ________________ than those who are forced to smile.
A.less boring
B.more aggressive
C.more boring
D.less aggressive
4. Which food is best for children's behavior at the table?
A.Small pieces of meat
B.Whole corn
C.A whole apple
D.A bone
2018-08-08更新 | 65次组卷
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文章大意:本文是一篇说明文。文章介绍了互惠主义在自然界中的作用以及对作弊者的影响。

【推荐3】The sign of a healthy personal relationship is one that is equally mutual (相互的) —where you get out just as much as you put in. Nature has its own version of a healthy relationship. Known as mutualisms, they are interactions between species that are mutually beneficial for each species. One example is the interaction between plants and pollinators (传粉者), where your apple trees are pollinated and the honeybee gets nectar (花蜜) as a food reward. But how are mutualisms affected by other organisms that take those rewards without providing a service in return?

A team of researchers recently researched that question. They investigated the abilities of diverse communities of mutualists, comparing how each deals with cheaters. Cheaters are species that steal the benefits of the mutualism without providing anything in return. An example of one of nature’s cheaters is nectar robbers. Nectar-robbing bees chew through the side of flowers to feed on nectar without coming into contact with the flower parts that would result in pollination.

The researchers produced mutualisms in the lab using yeast strains (酵母菌株) that functioned as mutualist species. Each yeast strain produced a food resource to exchange with a mutualist partner. They engineered four species of each type of mutualists as well as two cheater strains that were unable to make food resources.

The researchers created communities of yeast that differed both in the number of species and the presence of cheaters. They found that communities with higher numbers of mutualist species were better able to resist the negative effects of cheaters because there were multiple species of mutualists performing the same task. If one species was lost from the community due to competing with a cheater, there were other species around to perform the task, showing that the presence of more species in a community can reduce the negative effects of cheaters.

Their results highlight the importance of having multiple mutualist species that provide similar resources or services, essentially creating a backup in case one species goes extinct. It’s similar to the relationship between grocery stores and suppliers. Grocery stores have multiple suppliers to ensure that there are always goods available should something happen to one supplier.

The future study is to explore the possibility of a mutualist species becoming a cheater. The group is testing if mutualists that perform the same function might set up an environment that allows one of those mutualist species to become a cheater since there are other mutualists around that can fill that role.

1. Which of the following can be an example of mutualism?
A.Farmers and crops.B.Sunlight and plants.
C.Cities and wild animals.D.Humans and global warming.
2. What can be concluded from the study of communities of yeast?
A.More communities of yeast are better than one.B.More species of mutualists are better than one.
C.More species of mutualists lead to fewer cheaters.D.More communities of yeast lead to fewer cheaters.
3. According to the text, which of the following may have the same role as “suppliers” underlined in paragraph 5?
A.Nectar.B.Honeybees.C.Cheaters.D.Apples.
4. According to the study, what would happen in a community of mutualists?
A.Cheaters would become extinct.B.Cheaters would act as mutualist species.
C.A mutualist species would switch to cheating.D.Mutualist species and cheaters would work together.
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