Many people are aware of the beauty of a solar eclipse (日食), but are surprised to learn that lunar eclipses are often just as impressive. While total solar eclipse lasts only for a few minutes and can be seen only in a small area of a few kilometers, total lunar eclipse can last for several hours and can be seen over much of the planet. In fact, the beauty and stability of lunar eclipses make them a favorite of both amateur and professional photographers.
Lunar eclipses generally occur two or three times a year, and are possible only when the Moon is full. When we see the Moon, we are actually seeing sunlight reflected off the surface of the Moon When the Earth is positioned in between the Moon and the Sun, however, the Earth's shadow falls on the Moon, and a lunar eclipse occurs.
The type of lunar eclipse - total, partial, or penumbral (半影) - that occurs depends both on how much of the Moon passes through the Earth's shadow and through which part of the shadow it passes. A penumbral eclipse occurs when the Moon passes through the Earth's outer shadow. This type of eclipse is brief and frequently goes unobserved by all but astronomers. By contrast, total and partial eclipses occur when all or part, respectively, of the Moon passes through the umbra(本影) shadow of the Earth. These eclipses are quite easy to see and are widely observed.
Unlike solar eclipses, lunar eclipses are safe to watch. Solar radiation that occurs during an eclipse of the Sun can cause a form of burns of one's eyes known as eclipse blindness. In fact, the only way to safely view a solar eclipse is by using specially designed equipment. However, since the Moon's light is reflected sunlight, it is completely safe to watch a lunar eclipse without any special equipment, although a pair of binoculars can certainly help the viewer appreciate the beauty of this phenomenon
1.The underlined word "stability " most probably means_______.
A. strength B. position C. steadiness D. visibility
2.According to the passage, a partial lunar eclipse occurs________.
A. when the Moon passes between the Sun and the Earth
B. when all of the Moon passes through the Earth's umbra shadow
C. when only a part of the Moon passes through the Earth's outer shadow
D. when only a part of the Moon passes through the Earth's umbra shadow
3.The passage implies that penumbral eclipses are________.
A. longer-lasting than most solar eclipses
B. more common than partial or full lunar eclipse
C. the result of the shadow cast by the Moon onto the Earth
D. more difficult to observe than other types of lunar eclipse
4.According to the passage, it is safe to watch a lunar eclipse, unlike a solar eclipse, because ________.
A. moonlight is less strong than sunlight
B. a lunar eclipse is briefer than a solar eclipse
C. a lunar eclipse lasts much longer than a solar eclipse
D. special equipment can be employed to view a lunar eclipse
高三英语阅读理解中等难度题
Many people are aware of the beauty of a solar eclipse (日食), but are surprised to learn that lunar eclipses are often just as impressive. While total solar eclipse lasts only for a few minutes and can be seen only in a small area of a few kilometers, total lunar eclipse can last for several hours and can be seen over much of the planet. In fact, the beauty and stability of lunar eclipses make them a favorite of both amateur and professional photographers.
Lunar eclipses generally occur two or three times a year, and are possible only when the Moon is full. When we see the Moon, we are actually seeing sunlight reflected off the surface of the Moon When the Earth is positioned in between the Moon and the Sun, however, the Earth's shadow falls on the Moon, and a lunar eclipse occurs.
The type of lunar eclipse - total, partial, or penumbral (半影) - that occurs depends both on how much of the Moon passes through the Earth's shadow and through which part of the shadow it passes. A penumbral eclipse occurs when the Moon passes through the Earth's outer shadow. This type of eclipse is brief and frequently goes unobserved by all but astronomers. By contrast, total and partial eclipses occur when all or part, respectively, of the Moon passes through the umbra(本影) shadow of the Earth. These eclipses are quite easy to see and are widely observed.
Unlike solar eclipses, lunar eclipses are safe to watch. Solar radiation that occurs during an eclipse of the Sun can cause a form of burns of one's eyes known as eclipse blindness. In fact, the only way to safely view a solar eclipse is by using specially designed equipment. However, since the Moon's light is reflected sunlight, it is completely safe to watch a lunar eclipse without any special equipment, although a pair of binoculars can certainly help the viewer appreciate the beauty of this phenomenon
1.The underlined word "stability " most probably means_______.
A. strength B. position C. steadiness D. visibility
2.According to the passage, a partial lunar eclipse occurs________.
A. when the Moon passes between the Sun and the Earth
B. when all of the Moon passes through the Earth's umbra shadow
C. when only a part of the Moon passes through the Earth's outer shadow
D. when only a part of the Moon passes through the Earth's umbra shadow
3.The passage implies that penumbral eclipses are________.
A. longer-lasting than most solar eclipses
B. more common than partial or full lunar eclipse
C. the result of the shadow cast by the Moon onto the Earth
D. more difficult to observe than other types of lunar eclipse
4.According to the passage, it is safe to watch a lunar eclipse, unlike a solar eclipse, because ________.
A. moonlight is less strong than sunlight
B. a lunar eclipse is briefer than a solar eclipse
C. a lunar eclipse lasts much longer than a solar eclipse
D. special equipment can be employed to view a lunar eclipse
高三英语阅读理解中等难度题查看答案及解析
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NANJING, June 13,2009 (Xinhua) – China will see the longest total solar eclipse (日食) in 500 years on July 22, a scientist said Saturday.
The most important time of the total eclipse was expected to
begin from 9:00 a.m. to 9:38 a. m. (Beijing Time), said Wang
Sichao, a research fellow with the Nanjing – based Purple
Mountain Observatory under the Chinese Academy of Sciences.
“The total eclipse will l ast up to six minutes, which is the longest
one that can be seen in China in almost 500 years from 1814 to 2309,” Wang said.
He said viewers in parts of eleven provinces in China's southwestern, central-southern and eastern areas, such as Tibet, Hunan and Jiangsu, will be able to witness the total solar eclipse, while in most parts of Shanghai, viewers can see the spectacular phenomenon. For viewers in other provinces, including Beijing, they can observe a partial eclipse, he said.
A solar eclipse occurs when the moon is caught between the sun and the earth while each of them moves along their fixed orbits. In a total solar eclipse, the sun, the moon and the earth are directly aligned as the sun swings into the cone of shadow cast by the moon.
Wang said the next total solar eclipse that can be seen in China will fall on March 20 th, 2034. "But it can only be seen remote provinces, such as Tibet and Qinghai. It cannot not be compared with the upcoming one -- in terms of duration and number of cities that can see the eclipse," he added. The last total solar eclipse visible in China took place on Aug. 1 last year. It was observed in northwest China and lasted two minutes in Yiwu County of northwestern Xinjiang Uygur Autonomous Region, the best place to see the phenomenon.
72.According to the report, the total eclipse on July the 22 nd will last ________.
A.over a month B.about 38 minutes
C.about 6 minutes D.less than 30 minutes
73.Viewers can possibly witness the total solar eclipse in ________.
A.Liaoning B.Sichuan C.Beijing D.Xinjiang
74.When a total solar eclipse happens, ________.
A.the moon goes into the shadow cast by the sun
B.the earth stays between the sun and the moon
C.the sun temporarily moves into the moon’s orbit
D.the sun is in a line with the moon and the earth
75.Which is the best title for this report? ________.
A.China to witness longest total solar eclipse in 500 years
B.The most important total solar eclipse will favor China
C.The beginning time of the total solar eclipse is expected
D.China has been the best place to witness the solar eclipse
高三英语阅读理解简单题查看答案及解析
Many people enjoy the beauty of the snow. But do you really know the snow? Here are three biggest snow myths that will surprise you.
First of all, it’s a myth that no two snowflakes are the same. In 1988, a scientist found two identical snow crystals that had both formed in a snow storm in Wisconsin, USA. Since then scientists have come to learn that snowflakes can only form into 35 different shapes. Although scientists are also unsure why exactly the various shapes of snowflake form, they have identified eight major shapes, with each of these eight shapes having several different variations.
“Snow is white” is the second biggest myth. It’s actually colorless. Snow is made up of ice particles, and ice is translucent, which means that light does not pass through it easily, but rather it gets reflected. When light hits a snowflake, it gets reflected back from the snowflake’s many surfaces, often bouncing between these surfaces, and because of this that light is reflected back to our eyes as the color white. This is why, up close or magnified, a snowflake always looks clear, yet in reality appears as white.
Lastly, snow doesn’t always appear to us as the color white. Not counting the infamous yellow snow that everyone knows never to eat, you can also get naturally blue snow or even pink snow.
Deep snow can sometimes appear blue in color because the extra layers of snow create a filter for light, which causes more red light to be absorbed by the snow than blue light, meaning that it looks blue.
Likewise, snow can sometimes appear pink in mountainous regions or coastal Polar Regions due to it containing cryophilic fresh-water algae that have a red pigment in them.
As an interesting bonus fact, the fur of Polar Bears is actually made up of translucent fibers, trapping light between its many surfaces and making the Polar Bear look white, when in actuality if you were to examine a single piece of Polar Bear fur up close it would look clear – just like a snowflake.
It’s also a commonly known fact that, if shaved, a Polar Bear would be black in color. The reason a Polar Bear’s skin is black is because black is the color which locks in the most heat.
1.According to the passage, the underlined word “myth” means _________.
A.tale B.riddle
C.mystery D.misunderstanding
2.Why does a snowflake appear as white?
A.Because snow is white.
B.Because snow is made up of ice particles.
C.Because ice is translucent, light does pass through it easily.
D.Because the lights reflect back and forth between the snowflakes’ surfaces.
3.Which of the statement is true?
A.Polar Bears’ black skin can help them keep warm.
B.The color of the snowflakes are white, yellow, blue and pink.
C.Scientists have identified eight minor shapes of the snowflake.
D.The snow absorbs more blue light than red light, making it look blue.
4.Which of the following doesn’t belong to the three biggest snow myths?
A.Snow is white B.Snow always looks white
C.No two snowflakes are the same D.Polar Bear fur looks clear--just like a snowflake.
高三英语阅读理解中等难度题查看答案及解析
Most of the time, people are well aware of the circumstances of exchange: they exchange this for that. But in the rare circumstances when they’ve not prepared with gift-giving in return, they can be _________ with feelings of guilt. Receiving a gift, Jacques Derrida, a French thinker, thought, could make one feel like a _________ trapped in a cycle of economic exchange. People don’t like the feeling of being under obligation (人情债) , and try to dismiss the _________ they can feel as quickly as possible.
Private gift-giving, as the Frankfurt school theorist Theodor Adorno worried, has become an empty procedure. There’s no denying that in at least some cases, people give gifts _________. This has less to do with gift-giving itself, and more to do with the choosing of gifts. Gift-giving looks like an obligation, and a fairly _________one at that. Sure, there is giving gifts to lovers, friends and family. But then there is also the world of gift-giving like Secret Santa Claus, practices that keep gift-giving routines going well _________ the circles of people we know well enough to make choosing presents _________.
For these forced occasions, for, say, the coworker we’ve never spoken to, there are pre-printed cards and commercial guides. Even when the receiver is well-known, people want to _________ the effort needed for gifting. A relative once sent me a gift basket of dried fruit, nuts and cured meats; both the offending party and I are vegetarians.
If gift-giving has become more transaction (交易的), with the give-and-take a(n) _________ itself, so has complimenting.
This ____________ choice — fulfill your obligation to return the ____________ or resign yourself to guilt — comes from belonging to a society structured around commodities and their ____________.The trouble is, if compliments are transactions, feeling that we’re under obligation is a natural state of affairs. To imagine that we could completely overcome our ways of thinking about compliments, ____________, requires ____________ our social and economic forms of life. ____________ a difficult demand, this could be the true gift Adorno and Derrida were hoping for.
1.A.proud B.troubled C.happy D. exchange
2.A.owner B.loaner C.donor D. debtor
3.A.prejudice B.inferiority C.inequality D.priority
4.A.reluctantly B.quickly C.carefully D.gladly
5.A.affordable B.widespread C.influential D.commercial
6.A.within B.behind C.against D.beyond
7.A.unpleasant B.enjoyable C.adequate D.fashionable
8.A.minimize B.maximize C.complicate D.formalize
9.A.means B.reason C.end D.process
10.A.agreed B.limited C.forced D.suited
11.A.praise B.offence C.greeting D.favour
12.A.application B.promotion C.interaction D.exchange
13.A.therefore B.however C.moreover D.meanwhile
14.A.following B.restoring C.rethinking D.proceeding
15.A.Unless B.While C.Since D.Whether
高三英语完形填空困难题查看答案及解析
Most people are aware that, ____ , the relationship between Hong Kong and the Republic of the Philippines will become poorer.
A. if not dealing with carefully
B. if dealt not carefully with
C. if not carefully dealt with
D. if not carefully dealing with
高三英语单项填空中等难度题查看答案及解析
The School has become aware that many students are being prevented from doing their work because of other students playing games and watching movies. We're sorry it's come to this,but we don't have enough resources to support everything,and our educational mission comes first.
●NO RECREATIONAL ACTIVITIES,SUCH AS GAMES AND MOVIES,ARE ALLOWED IN ANY OF THE LABS 8:30 AM TO 4:30 PM WEEKDAYS.
Work on course-related game development is excepted. Note that it is usually very obvious whether game activity is recreational.
●MULTIPLE LOGINS AT THE SAME TIME ON THE SAME USER ACCOUNT ARE FORBIDDEN.
If you have a course-related need for an exception to this rule,please contact the tech staff (supportatsignscs. carleton. ca).
For our general policy on lab usage,please see scs. carleton. ca/ labpolicy. Note that it includes:
●NO FOOD(except dry snacks and bottled drinks)
●NO PROPPING DOORS OPEN
1.Why does the writer write this announcement?
A. To emphasize the must-be-obeyed rules in the lab.
B. To ask the students to pay for what they've done.
C. To remind students to bring something.
D. To criticize bad-behaving students.
2.According to the announcement, what is the most important thing for students to do in class?
A. Playing computer games. B. Watching movies.
C. Completing the learning tasks. D. Finishing all assignments before class.
3.According to the announcement, students have to contact the tech staff when______.
A. they want to log in the website
B. they need to repair their computers
C. they forget their password to enter the account
D. they want to share one user account at the same time
4.Which food could NOT be brought into the lab?
A. Biscuits. B. An apple.
C. A bottle of water. D. Bread.
高三英语阅读理解中等难度题查看答案及解析
So suddenly________that the animals in the zoo looked very frightened during the total solar eclipse.
A.did the sky turn dark | B.the sky did turn dark |
C.turned the sky dark | D.was the sky turned dark |
高三英语单项填空简单题查看答案及解析
. --Did you see ________ may be the longest total solar eclipse (日全食)in 500 years yesterday?
--No, it was cloudy above my city at that time.
A. what B. that C. who D. all
高三英语单项填空简单题查看答案及解析
Most people are aware that outdoor air pollution can damage their health,but many do not know that indoor air pollution can also have significant health effects.Environmental Protection Agency studies indicate that indoor levels of pollutants may be 3~5 times,and occasionally more than 100 times,higher than outdoor levels.These levels of indoor air pollutants may be of particular concern because most people spend about 90% of their time indoors.
There are many sources of indoor air pollution in any home.These include sources such as oil,gas,coal,wood,and tobacco products,building materials,wet or damp carpet,and furniture made of certain pressed wood products,products for household cleaning and maintenance,personal care,or hobbies,central heating and cooling systems.
Immediate effects may show up after a single exposure (暴露) or repeated exposures.These include irritation of the eyes,nose,and throat,headaches,dizziness.Such immediate effects are usually shortterm and treatable.Sometimes the treatment is simply removing the person’s exposure to the source of the pollution,if it can be identified.
The likelihood of immediate reactions to indoor air pollutants depends on several factors.Age and preexisting medical conditions are two important influences.In other cases,whether a person reacts to a pollutant depends on individual sensitivity,which varies tremendously from person to person.Some people can become sensitized to biological pollutants after repeated exposures,and it appears that some people can become sensitized to chemical pollutants as well.
Certain immediate effects are similar to those from colds or other viral (病毒性的) diseases,so it is often difficult to determine if the symptoms are a result of exposure to indoor air pollution.While pollutants commonly found in indoor air are responsible for many harmful effects,there is considerable uncertainty about what concentrations or periods of exposure are necessary to produce specific health problems.People also react very differently to exposure to indoor air pollutants.Therefore,further research is needed to better understand the effects of indoor air pollution and to find efficient ways to protect our health.
1.According to the first paragraph,which of the following is NOT true?
A.People often fail to notice indoor air pollution.
B.Indoor air pollution sometimes is more dangerous than outdoor air pollution.
C.Outdoor air pollution may not be so serious as indoor air pollution.
D.It is obvious that people have been paying more attention to indoor air pollution.
2.According to the author,which may NOT be the source of indoor air pollution?
A.Building materials. B.Wet carpet.
C.Cooling system. D.Refrigerators.
3. What does the underlined word “irritation” in the third paragraph probably mean?
A.Bad intention. B.Much sensitivity.
C.Injury. D.Carelessness.
4. Which of the following might be the best title for the passage?
A.Reactions of Pollution B.Danger from Home
C.Pollution Resources D.Different Pollutions
高三英语阅读理解中等难度题查看答案及解析
There are many places in the world have been visited only by a few, many are of enormous beauty.
A. where; of which B. which; of whom
C. that; of which D. that; of whom
高三英语单项填空中等难度题查看答案及解析