题目
题型:不详难度:来源:
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
小题1:The underlined word "stability " most probably means_______.
A.strength | B.position | C.steadiness | D.visibility |
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 |
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 |
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 |
答案
小题1:C
小题2:D
小题3:D
小题4:A
解析
试题分析:
本文介绍了月食发生的条件、月食的类型和观看。月食只能在满月时发生,有月全食、月偏食和半影月食三种情形:月全食指月球全部进入地球本影,月偏食指月球部分进入地球本影,半影月食指月球离地球较远、只是从地球本影最外缘掠过;观看月食是完全安全的,无需设备。
小题1:词义推断题。第一段…total lunar eclipse can last for several hours and can be seen over much of the planet.说的是月全食时间上的持久性和可见区域的广阔性。这种特性使其成为专业摄影师和业余摄影爱好者的最爱。stability指的是月全食在时间上的持久稳定,词义与steadiness相近,故C项正确。
小题2:细节题。如出现A项描述的情况,会发生日食;B项情况出现会发生月全食;C项情况出现发生半影月食,即月球从地球本影外缘经过,此时月球光线略略变暗,很难被人注意。由第三段…total and partial eclipses occur when all or part, respectively, of the Moon passes through the umbra shadow of the Earth. 可知,月球全部进入地球本影发生月全食,部分进入地球本影发生月偏食。故D项正确。
小题3:细节题。由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.可知,半影月食时间短,经常不为人注意。故选择D项。
小题4:细节题。最后一段…since the Moon"s light is reflected sunlight, it is completely safe to watch a lunar eclipse without any special equipment告诉我们,月光是太阳光的折射,所以观察月食是绝对安全的。原因只能是月光比太阳光线弱。选择A项。
核心考点
试题【Many people are aware of the beauty of a solar eclipse (日食), but are surprised t】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
Teenagers must act on an endless parade of choices.Some choices.including smoking.Come with serious consequences.As a result, adolescents often find themselves trapped between their impulsive tendencies(-Just try it!)and their newfound ability to make well-informed and logical choices(-Wait, maybe that’s not such a good idea!).
So what makes the teenager’s brain so complex? What drives adolescents-more than any other age group-to sometimes make rash or questionable decisions?
If you have ever thought that the choices teenagers make are all about exploring and pushing limits, you are on to something. Experts Experts believe that this tendency marks a necessary period in teen development.The process helps prepare teenagers to confront the world on their own. It is something all humans have evolved to experience-yes, teens everywhere go through this exploratory period.Nor is it unique to people:Even laboratory mice experience a similar stage during their development.
For example,laboratory experiments show that young mice stay close by their mothers for safety. As mice grow.their behavior does too.“When they reach puberty,they’re like,‘I’m gonna start checking out how this environment looks without my mom,…explains Beatriz Luna,of the University of Pittsburgh.
As a developmental cognitive neuroscientist,Luna studies those changes that occur in the brain as children develop into adults.She and other researchers are showing how the teen experience can lead to powerful advantages later in life.Take mice again:Young mice that explore most tend to live longest——that is,unless a cat eats them,Luna adds.
小题1:What is the best title for the text?
A.Teenagers make endless choices |
B.The teenage brain drives them to be different |
C.How the teenage brain develops |
D.Researches about the teenagers |
A.It means “you are wrong”. |
B.It means“you lose your way”. |
C.It means“you get the point”. |
D.It means“you are off the point”. |
A.make no mistakes in his life. |
B.have advantages over others. |
C.loSe his confidence even his life. |
D.experience no failure and live Iongest. |
A.young mice try to look for safety. |
B.Young mice like to stay with their mothers. |
C.Mice also experience a period to explore the world. |
D.Mice experience different stages. |
A.How call a teenager make right choices |
B.Why the parents shouldn’t allow teenagers to smoke |
C.What has been discovered in the lab experiment. |
D.What really goes on in the teenage brain. |
"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(气孔) 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.
小题1:ozone does harm to plants mainly by ________.
A.exposing them to strong sunlight |
B.damaging the structure of their leaves |
C.adding more pores to the roots |
D.making the land unfit for the plants to grow |
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. |
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 |
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 |
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 |
The daughter of one of my friends English in primary school, her foreign teacher’s blindness psychology. She did not want to go on English until middle school, a college student studying English slowly her interest in the language.
It is better to have the child learn Chinese than to have some difficulty learning English for several years. Having been engaged in English education, find that despite(尽管) their excellent , many students have command of English words and phrases. So I suggest that children
classical Chinese prose(散文),rather than them to learn English hurriedly. Otherwise, they may let go the best time to the language ability of their mother tongue.
小题1: |
|
小题2: |
|
小题3: |
|
小题4: |
|
小题5: |
|
小题6: |
|
小题7: |
|
小题8: |
|
小题9: |
|
小题10: |
|
小题11: |
|
小题12: |
|
小题13: |
|
小题14: |
|
小题15: |
|
小题16: |
|
小题17: |
|
小题18: |
|
小题19: |
|
小题20: |
|
E-mails, screen savers, and electronic greeting cards can carry a secret code which is able to turn on the computer’s microphone, make a recording, and forward it to someone else without the user’s knowledge.
In fact any attachments (附件) sent to a computer, whether it is a game of Space Invaders, or a moving picture, can possibly be used to spy (窥探).
Experts say people should always think twice about opening attachments because --- although not common --- bugging (窃听) by computer can and has been done.
Bill Lyons, head of the Internet Security Company Finjan, said, “People in the army have tested this and you can be sure, if people in general are aware of it, then computer hackers (黑客) are aware of it. The frightening thing is that there are tools on the Internet which people, using a simple search method, can find, and which will enable them to attach this dangerous code to simple attachments.”
小题1:What is the advice given in the passage?
A.Use secret codes to record other people’s conversation. |
B.Be careful when opening an attachment. |
C.Never open any attachments. |
D.Never use secret codes. |
A.nobody seems to believe such things |
B.nobody knows the danger of the code |
C.tools can easily be used to tie dangerous codes to e-mails |
D.effective ways can never be found to deal with the problem. |
A.A moving picture cannot be used to spy. |
B.Electronic greeting cards cannot carry a secret code. |
C.A secret code is used to destroy the computer system. |
D.Any attachments sent to a computer may carry a secret code. |
Should the color be white or black? Or perhaps navy blue! Well, choosing the right graduation dress for middle school students can be a little difficult at times. Here are some ideas for graduation dress for middle school students.
For many students, middle school graduation marks a big change in their lives. This is a step that takes students away from junior high school but towards the elementary level before senior high school. Compared to elementary (初级的) school, middle school means more lessons and more classes, but of course, students can also see it as an opportunity to make new friends.
Well, it is no wonder that the graduation day of a middle school is often planned formally. Although this occasion is not considered to be really formal like a high school graduation, it is still celebrated in many ways. Besides, it is also considered to be a very important part of someone"s life.
Many schools often have middle school graduation parties. Well, the question that often arises in the minds of young students is about the right graduation dress for themselves. Long flowing dress with caps are commonly seen. Students should always stick to a common graduation dress that creates uniformity (统一) among all. The dress can be royal blue, black or even golden. If they seem too formal for the party, you can even plan for a common color for all the students. For example, white shirts with black pants or skirts can serve the needs of such a special occasion.
Whether the graduation party is simple or great, the graduation dress for middle school students should be planned accordingly. The main idea would be to accept the success of the students and celebrate with family and friends.
小题1:What does the text mainly talk about? (no more than 10 words)
_____________________________________________________________
小题2:What does middle school mean to students compared to elementary school? (no more than l2 words)
_____________________________________________________________
小题3:Please explain the underlined word “arises’’ in Paragraph 4 in English. (no more than 3 words)
_____________________________________________________________
小题4:What is the common graduation dress like? (no more than 9 words)
_____________________________________________________________
小题5:What is the purpose of a graduation party? (no more than l5 words)
_____________________________________________________________
最新试题
- 1下列关于磁感应强度的说法中正确的是( )A.若长为L、电流为I的导线在某处受到的磁场力为F,则该处的磁感应强度必为B
- 2一根50厘米长的木棍,竖直立在水平地面上,影子的长是40厘米,与此同时,一个旗杆的影长16米,则这旗杆的高是( )A.
- 3已知金属锌发生光电效应时产生的光电子的最大初动能Ek跟入射光的频率的关系图象如图中的直线1所示。某种单色光照射到金属锌的
- 4有A、B、C三种金属,两两分别接触并同处于稀H2SO4中,反应冒气泡,判断三种金属活动性顺序 A.A>C>
- 5下图是“我国某天气系统在某地过境时的气压与风速随时间的变化规律示意图”,分析判断题。小题1:该天气现象是A.东南沿海台风
- 6化学兴趣小组向盐酸与氯化钙的混合溶液中逐滴滴入碳酸钠溶液至过量,记录滴入的碳酸钠溶液的质量(x)与有关量的变化关系如图所
- 7Much ____ he has a good taste for China’s Football Matches,
- 8实践的观点在马克思主义哲学中具有重要的地位和作用,表现在 ( )①在人与世界的关系方面,从实践出发理解周围的
- 9成因分类不相同的岩石是A.石灰岩B.页岩C.砂岩D.大理岩
- 10根据图中通电螺线管的N、S极,标出螺线管上导线中的电流方向.
热门考点
- 1______, his mother has to take care of him at home.A.Being i
- 2已知双曲线x2-y2a=1的一条渐近线与直线x-2y+3=0垂直,则a=______.
- 3下列各项中加点的词语使用正确的一项是 ( )A.针对钓鱼岛撞船事件,我外交部发言人再度声明钓鱼岛
- 4The little girl always when she answers the questio
- 5下列词语中加点字的读音不正确的一项是( )A.簇新(cù)干瘪(biě)通衢(qú)大道干瘪(biě)B
- 6分解因式:m3-m=______.
- 7 —Please accept my apology for taking your umbrella by mista
- 8汉武帝“”独尊儒术,李贽批判孔子,康有为尊孔子为改革先师,袁世凯尊孔复古“”新文化运动中“”打倒孔家店,“”文革中的批林
- 9假如你是小华, Jane是美国人。在她暑假中国游玩时你们相识,并成为好朋友。Jane回国后,你很想念她,于是给她写了一封
- 10如图,△ABC内接于⊙O,点D在OC的延长线上,sinB=,∠D=30°.(1)求证:AD是⊙O的切线.(2)若AC=6