As people in Beijing and northern China struggle with severe air pollution this winter,the toxic(有毒的)air is also making life hard for plants and even food crops of China．
"in the last 50 years there has been a 1 6-fold increase in ozone(臭氧)pollution”in the Beijing area，said Hanqin Tian of Auburn University in Alabama,who studies the effects of China's pollution and climate change on plants．
Ozone is particularly harmful to plants because it damages the pores(氣孔)  on leaves，called stomata,which plants use to regulate how much water evaporates from the leaves．That，in turn，affectS how much water a plant must take up through its roots．Changes in water uptake by plants have been documented in other parts of the world，including the United States，as having major impacts on regional groundwater and surface water supplies．
In studies of the long-term productivity of plants，Hanqin Tian and some of his colleagues show that ozone pollution,along with climate change，has been lowering plant productivity in China,which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．
The worst effects on plants are likely to be in areas where the growing pollution problem is just fairly new, said Arthur Chappelka, also a plant researcher at Auburn University．Some plants are more resistant to pollutants than others，he said，and the plants that are living today in long-polluted urban areas are likely to be only those that are very pollution tolerant．
Away from the cities, however, where crops are necded to feed China’s yast population, the effeets of the growing pollution on crops is a significant concern.
“In some ways it affects the crop production and food securiy of China,”said Hanqin Tian.“Air quality is really important for human health, plants and ecosystem and sustainability.”
The problem is bound to get worse as China continues to develop economically, he said, and so he and other researchers continue to urge the Chinese government to take action to reduce emissions from cars and industries.
小題1:ozone does harm to plants mainly by ________.
A．exposing them to strong sunlight
B．damaging the structure of their leaves
C．a(chǎn)dding more pores to the roots
D．making the land unfit for the plants to grow
小題2:Which of the following statement does Hanqin Tian support?
A．Ozone pollution has increased 1 6 times in the past 30 years．
B．Ozone pollution has lowered plant productivity alone．
C．Plants can take in a large amount of carbon and other pollutants．
D．The toxic air has few effects on food supply in China．
小題3:What Can we infer from the passage?   
A．Healthy foods are not available in Beijing．
B．Some kinds of plants aren’t affected by air pollution．
C．Crops in China are hard to feed its large population．
D．People should stop developing economically
小題4:According to the passage，the Chinese govemment should
A．care more about developing economy
B．reduce the number of cars and industries
C．continue to make more researches
D．take measures to reduce carbon emissions
小題5:What′S the best title of the passage?
A．Polluted air damages plants and crops
B．Air pollution is becoming more serious
C．China’s air pollution and climate changes
D．Food security in China

小題1:B
小題2:C
小題3:B
小題4:D
小題5:A

試題分析：文章介紹了臭氧和其他有害氣體對(duì)植物的生長(zhǎng)和農(nóng)作物的產(chǎn)量所具有影響和危害。
小題1:細(xì)節(jié)題：根據(jù)第三段第一句“Ozone is particularly harmful to plants because it damages the pores(氣孔)  on leaves”臭氧對(duì)植物特別有害因?yàn)樗茐娜~子氣孔。故選B。
小題2:推理題： 根據(jù)第四段最后一句“ the plants Can absorb to fight all the emissions from the burning offossil fuels”植物可以吸收所有排放燃燒礦物燃料。故選C。
小題3:推理題：根據(jù)第四段中“which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．”減少二氧化碳和其他污染物的數(shù)量,植物可以吸收對(duì)抗所有的排放燃燒礦物燃料。由此可知有些植物不受空氣污染影響。故選B。
小題4:細(xì)節(jié)題：根據(jù)最后一段最后一句“urge the Chinese government to take action to reduce emissions from cars and industries.”敦促中國(guó)政府采取行動(dòng)來(lái)減少汽車尾氣排放和工業(yè)。故選D。
小題5:主旨題：全文介紹了臭氧和其他有害氣體對(duì)植物和農(nóng)作物的影響和危害。故選A。
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科目：高中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

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科目：高中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

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①                                                                      
②                                                                      
③                                                                      
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The decline in actual physical violence in schools is even more dramatic: It was down 74% between 1992 and 2010, according to the latest US Department of Justice data.
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Besides education and crime prevention at the social level, medicine treatment and better access to mental healthcare also contribute to this downward trend in victimization of self and others.
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科目：高中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

Five Ways to Rock the Rest of the Semester
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Power Down
So you stayed up too late last night reading Mockingjay for the fifth time. Oops! When you’re that fired, your schoolwork suffers. Instead of studying inefficiently while you are sleepy, allow yourself a 15-minute afterschool power nap. Studies show that even a few minutes of shut-eye can improve memory and concentration.
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Not quite grasping that super complicated concept in your chemistry class? You may need to change the way you take notes. Instead of recording every word your teacher says, try using visual hints like pictures, symbols and word bubbles. You can even switch computer fonts or pen color for the important stuff.
Dream On
Your bed’s not just for zzz’s. Experts say it may be good to study in bed, too. Why? We’re able to absorb more right before bed because we’re less distracted and the new information stays in our minds as we sleep. So, slide into bed with a textbook or notes, read for 15 minutes, and then turn off the lights for some sweet and smart dreams.
Brain Food
You’re in the middle of a biology exam when your mind goes blank. You knew this stuff cold at home, but now you can’t tell a ribosome from a chloroplast. What’s going on? Your brain’s in need of some refueling. Have some snacks like apple slices or cheese before class, and have plenty of water, too. If your teacher doesn’t mind, pop in a piece of gum during an exam. Some scientists think the chewing increases the flow of oxygen to the brain.
Smart Move
Ugh! You’re taking an English test and you cannot remember the past participle of “understand”. What to do? Skip it. Test taking is all about timing, so don’t waste it on tricky questions. Move ahead and answer everything you know before returning to the ones you don’t. Chances are, once you get back to the toughies, you’ll recall the answer or at the very least, you’ll have a little more time to come up with one that works.
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