高考英语暑假自选训练（9）
阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。
There are plenty of good reasons to buy organic products, but nutrition may not be one of them, suggests a new study, which found no difference in antioxidant (抗氧化剂) levels between organically and conventionally (常规地疯狂英语900句) grown onions, carrots, and potatoes.
The study only looked at three types of vegetables and just a few lect nutrients. But the experiment was part of a bigger project that was so systematic and strictly controlled that the findings likely apply to other crops, too.
“Giving preference to organic products becau they contain more bioactive components is doubtful and not supported by scientific evidence,” Knuthn said. “Still, there are many good reasons for the consumer to lect organic food products, including abnce of pesticide residues (农药残留) in foods, animal welfare, and environmental protections.”
Argument over whether organic produce is more nutritious than conventional varieties has
been around for at least a decade, said Jeffrey Blumberg, director of the Antioxidants Rearch Laboratory at TuftsUniversity in Boston. “Some studies have suggested that organically grown plants contain higher levels of healthful antioxidants, possibly becau some antioxidants act as natural fungicides (杀真菌剂), pesticides and incticides,” he said. “The idea is that, without help from industrial chemicals, plants on organic farms need to work harder to protect themlves. They end up becoming more nutritious as a result.” But plenty of other studies have shown no such relationship.
“I understand that organic farmers would love to be able to say that theirs are super-fruits and super-vegetables becau there are higher amounts of the compounds in them,” Blumberg said. “If you want to buy them becau you think they’re safer for the planet to grow things that way, or becau you think pesticides are bad for you or your family, or you like that they come from a shorter distance away, that’s great.”
“But if you want to buy them becau they’re more nutritious, you’re confud, and we don’t know if that’s true or not.”
1. The new study proves that.
A. there are plenty of good reasons to buy organic produce
托福听力算分B. nutrition is one of the good reasons to buy organic produce
C. some organically and conventionally grown foods have the same antioxidant levels
D. organic produce is harmful to our health
2. Why do people prefer organic products?
A. Becau they think organic products have no bioactive components. 2016 美国大选
女英文名字大全B. Becau scientific evidence supports organic products can make them stronger.
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C. Becau it’s proved that organic produce is more nutritious than conventional varieties.
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D. Becau they think organic food products have no harmful things.
3. The fourth paragraph mainly tells us.
绝配网A. it’s unclear whether organic produce is more nutritious than conventional varieties
B. organically grown plants contain higher levels of healthful antioxidants
C. plants on organic farms need to work harder to protect themlves
D. plenty of other studies have shown no such relationship
4. Which is NOT the reason for you to buy organic products according to Blumberg?
A. There are higher amounts of the compounds in them.
B. They’re safer for the planet to grow things that way.
C. Pesticides are bad for you or your family.
D. They are more nutritious.
【参考答案】1—4、CDAD
虚拟语气练习题
阅读理解。
Are you preparing for a big test? If so, you may want to go play some basketball in between hitting the books. Doctors are starting to find more and more information that suggests a connection between exerci and brain development. Judy Cameron, a scientist at Oregon Health and ScienceUniversity, studies brain development. According to her rearch, it ems that exerci can make blood vesls(血管), including tho in the brain, stronger and more fully developed. Doctor Cameron is sure that this allows people who exerci to think better. As she says, “ while we already know that exerci is good for the heart, exerci can actually cau physical changes in the brain.”
The effects of exerci on brain development can even be en in babies. Babies who do activities that requires a lot of movement and physical activity show greater brain development than babies who are less physically active. Even a little movement can show big results. Margaret Barnes, a scientist, also believes in the importance of exerci. She thinks that many learning disabilities that children have in primary school or
high school can result from a lack of movement as babies. “Babies need movement that encourages and excites their five ns. They need to t up a connection between motion and memory. In this way, as they get older, children will begin to connect physical activity with higher learning,”trademanager says Margaret.
Older people can develop their brains as well. CornellUniversity studied a group of niors who have a short—term memory increa of up to 40 percent after exercising just three hours a week. The exerci does not have to be very difficult, but it does have to increa the heart rate. Also, just like the motion for babies, exerci for older people should not be too simple. Learning some new skills or actions, such as with yoga or tai-chi helps to open up memory paths in the brain that may not have been ud for a long time. For most people, any type of physical activity that increas the heart rate is helpful. The main aim is to increa the brain’s flow of blood. And your brain can benefit from as little as two to three hours of exerci a week.
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