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A sandstorm, also known as a dust storm, is exactly what it sounds like. A very strong windstorm especially in the desert carries clouds of sand or dust that greatly reduces visibility. This wind is usually caused by convection currents (对流气流), which are created by intense heating of the ground, and is usually strong enough to move entire sand dunes. Air is unstable when heated, and this instability in the air will cause higher winds to mix with winds in the lower atmosphere, producing strong surface winds.
Sandstorms can disturb people’s travel, and can sometimes destroy whole roads, and dry flat areas. Similar dust storms can be found on the planet Mars, and are thought to be seasonal. Today, the destruction of forests and too much farming of farmland can lead to sandstorms. Too much use of water resources can also cause sandstorms.
In the United States of America, sandstorms are rare because of the lack of large deserts and more importantly the development of proper agricultural techniques. The last recorded destructive sandstorm in American history was the Dust Bowl, which occurred on July 16, 1971 and was widely recorded by meteorologists (气象学家).
To protect themselves from sandstorms, some people wear protective suits. Special equipment can be fixed in some cars to prevent sand from getting into the engine. Sandstorms can cause coughs, and the sand and dust has also been known to carry “infectious diseases”. Sand particles, unlike dust ones, will block air passages, and cause a person who breathes them in to choke. Dust particles may cause an allergic (过敏的) reaction.
小题1:Which of the following plays the first part in forming sandstorms?
A.The instability of the sand.
B.The instability of the wind.
C.The intense heating of the ground.
D.The speed of the wind.
小题2:From the second paragraph, we can learn that at present _______.
A.sandstorms are more often seen on Mars than on Earth
B.sandstorms have led to the lack of clean water resources
C.farming brings more harm than benefits to humans
D.human activities are a major cause of sandstorms
小题3:The author will most probably agree that ________.
A.there will soon be no sandstorms in the USA
B.humans haven’t thought of any way to deal with sandstorms
C.death caused by sandstorms is increasing all the time
D.humans should make more efforts to stop soil turning into desert

小题1:C
小题2:D
小题3:D

试题分析:文章介绍了沙尘暴的形成和危害,已经如何防止沙尘暴。
小题1:细节题:从第一段的句子:This wind is usually caused by convection currents (对流气流), which are created by intense heating of the ground,可知沙尘暴的最初形成是因为地面的热量。选C
小题2:细节题;从第二段的句子:Today, the destruction of forests and too much farming of farmland can lead to sandstorms. Too much use of water resources can also cause sandstorms. 可知现在沙尘暴的形成主要是人的活动。选D
小题3:推理题:从第三段的句子;In the United States of America, sandstorms are rare because of the lack of large deserts and more importantly the development of proper agricultural techniques.可知作者认为人类应该努力不让泥土变成沙漠。选D
点评:文章介绍了沙尘暴的形成和危害,已经如何防止沙尘暴。内容比较适中,对于考生的能力要求不高,只要认真细致阅读,不难发现答案。可以先看题目再读文章,这样可以提高阅读的速度。还要准确定位考点。特别是推理题,要结合上下文的暗示做题,掌握方法是关键。
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B.We can send emails outdoors through wireless Internet.
C.Laptops enable us to do business everywhere.
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A.connecting to another computerB.switching off the Wi-Fi button
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小题14:
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科目:高中英语 来源:不详 题型:阅读理解

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What is Greenbelt Alliance (联盟)?
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4. Teach people in the Bay Area why the Greenbelt is important and what they can do to help save it.
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A.The Greenbelt is the largest open land in the United States.
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A.It builds new buildings on open land.
B.It buys large open land for the Bay Area.
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科目:高中英语 来源:不详 题型:阅读理解

She took up skating at age 85, made her first movie appearance at age 114, and held a concert in the neighborhood on her 121st birthday.
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      Steve Austad at the University of Texas agrees. “People can live much longer than we think, ”he says. “Experts used to say that humans couldn’t live past 110. When Calment blew past that age, they raised the number to 120. So why can’t we go higher? ”
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      Won’t new anti-aging techniques keep us alive for centuries? Any cure, says Miller, for aging would probably keep most of us kicking until about 120. Researchers are working on treatments that lengthen the life span of mice by 50 percent at most. So, if the average human life span is about 80 years, says Miller, “adding another 50 percent would get you to 120. ”
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B.scientists cannot find ways to slow aging
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A.Jerry Shay. B.Steve Austad
C.Rich Miller D.George Martin
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A.Most of us could be good at sports even at 120.
B.The average human life span cannot be doubled
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科目:高中英语 来源:不详 题型:阅读理解

To me, the ocean is our greatest wilderness. I love swimming in it , surfing its waves, watching it from shore and thinking about all the life living unseen under the surface.
When I take my little kids to check out tide pools, we’re overjoyed when we find a sea star or some shellfish. Lately, though, I've noticed a change in my favorite pools: there are more sea grasses and fewer animals with shells.
I can't help feeling these small changes portend something more troubling about our oceans. It matches what scientists are telling us: our oceans are being troubled by carbon dioxide that threatens corals, colorful fish, salmon, sea otters, even whales. Our oceans are facing a major change.
Every hour, a million tons of carbon dioxide from cars, factories and power plants rain down on the world’s oceans. Carbon pollution brings about a chemical reaction that turns sea water more acidic (酸的) and takes away things important for sea animals .
Some of us are already feeling the effects of this growing crisis(危机). Shellfish farmers in the Pacific Northwest have reported a decrease in natural and farmed oysters(牡蛎). Just this week, a new studyproved the link between the huge reduction in the numbers of oysters and ocean acidification. As polar waters become more acidic, Alaskan fishermen are troubled by the future of smaller fish.
Without action, ocean acidification will have a disastrous influence on the food chain, affecting not only sea life but the people who depend on it for food and their living. Already, our oceans have become 30 percent more acidic since preindustrial times, and it gets worse every day. We can stop this frightening dream, but only if we act now.
That's why the Center for Biological Diversity has started a petition (请愿书) requesting President Obama and the Environmental Protection Agency to develop a plan to deal with ocean acidification. Decisive action can save sea life as we know it.
Now it isn’t too late to save our oceans and sea life. With immediate action to reduce carbon dioxide release we can start taking important steps today to deal with this disastrous situation. Join me in our petition calling for a national plan to save our oceans.
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A.happinessB.angerC.concernD.comfort
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A.the harm of sea grasses
B.carbon pollution in the sea
C.that the petition may be turned down
D.how fishermen can make a living in the future
小题4:What is the main purpose of the text ?
A.To inform.B.To educate.C.To persuade .D.To instruct.

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