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6.Why can’t ultraviolet light scorch our skin on E
［A］Because the Earth’s atmosphere can make ultraviolet light less harmful.
［B］Because ultraviolet can’t reach the Earth at all.
［C］Because the Earth is far away from those planets radiating ultraviolet light.
［D］Because other space places is near from those planets radiating ultravioletlight.
参考答案
更多 “ 6.Why can’t ultraviolet light scorch our skin on E ［A］BecausetheEarth’satmospherecanmakeultravioletlightlessharmful.［B］Becauseultravioletcan’treachtheEarthatall.［C］BecausetheEarthisfarawayfromthoseplanetsradiatingultravioletlight.［D］Becauseotherspaceplacesisnearfromthoseplanetsradiatingultravioletlight. ” 相关考题
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CIn most situations, light helps us see. But nowadays humans are using too much of it so that it is in fact a kind of pollution.When it comes to looking at the night sky, too much light makes it difficult for us to watch some of life’s most wonderful sights: stars, planets and even galaxies(星系).According to scientific research, about 2, 500 stars can be seen by the human eye without using any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big cities, people cannot see the sky filled with stars like they did in their childhood.Light pollution affects more than just our view of sky. Research shows that lots of nighttime light can harm wildlife, too.When birds fly to another place over cities, they sometimes get lost by the brightness and fly in circles(圈) until they drop from tiredness. Sea turtles(海龟) need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.Too much light at night may even affect human health, but scientists are not sure of that. They are still learning more.In order to prevent things from going worse, governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are truly needed. They also shine lights down at the ground instead of up into the sky and use lower brightness levels.Hopefully, in the near future, humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life, too.27. Why does the writer think that too much light is a kind of pollution?A. Because there are fewer and fewer stars.B. Because human health has been affected.C. Because too much light is a waste of energy.D. Because some of the wildlife can be harmed.
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Which of the following is NOT mentioned(提到)in this passage?A. The problems that light pollution has caused.B. The reason why humans use too much light.C. The ways that light pollution can be reduced.D. The reason why fewer stars can be seen than before.
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What other services does your company provide in addition to dispatching securities?A.Our company can also provide escort serviceB.Our company can also provide patrolling serviceC.Our company can also provide investigation on the sceneD.Our company can also provide security techniques and equipment.
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–Can you come to our party this Friday?–()
A、Yes, that would be fun.B、No, I don't.C、Yes, but I'm busy this Friday.D、No, I don't like it.
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－－Must we finish our homework now? －－No, you ______. You _______ finish it after school.
A.needn't , mayB.mustn't , mayC.can't , canD.needn't , must
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29． When it thunders, we always see the light before we hear the sound．______ It’s becauseA． our eyes are in front of our earsB． our eyes are cleverer than our earsC． our eyes can see but our ears can-tD．light goes faster than sound
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The main idea of paragraph 2 is______.A. colors may have effect on our work and studyB. colors do have effect on our moods (情绪)C. light and bright colors make people happyD. factory workers can work better in a bright room
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What can we do for the case?_________
A.We would condult our lawyerB.The case is difficultC.I don't care about it
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The light of his room is still on, so he ( ) out.
A、mustn't have goneB、mustn't goC、can't have goneD、can't go
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There is no light in the room.I think he ( ) in.
A、should not beB、mustn't have beenC、mustn't beD、can’t be
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We drove to the station at full speed and caught the train by_____.
A、skin of our teethB、the salt of the earthC、a lion in the wayD、a piece of cake
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---- Look! The man at the gate ________ be our headmaster. He is always standing there every morning.--- - No, it ________ be him. He is holding a meeting in the office now.A.must, can’t B.must, mustn’t C.can’t, can’t D.can’t, mustn’t
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27．If we travel by car ,we_________．A． can't travel fifty or one hundred miles a dayB． can-t stop at a hotel to spend the nightC． can make our own timetable 'D． can travel to a very far place in several minutes
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Why do the American doctors think of using laser light to treat heart disease?A．Beeause laser light is quite powerful．B．Because laser light is penetrating．C．Because laser light can destroy the blocking materials in human’s artery．D．Because laser light can travel through the human body．
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Passage Three
Whenyou stretch out in the sun you can do one of the three things:you can use no suntan oil,an ordinary sun tan oil;or Bergasol.
If you don′t use any sun tan oil when you′re in the sun,you will burn surprisinglyquickly.If you use an ordinary sun tan oil,you will protectyour skin to a lesser or greater degree.How much protection depends on the"protection-factor number"on the bottle.Some oils block out so manyof the sun′s rays and you can stay in the sun all day without burning but youwon′t go very brown,either.
Bergasol will protect your skin like an ordinary sun tan oil.It also has a tan acceleratorthat speeds up the rate at which the sun activates the skin cells that producemelanin(黑色素).It is melanin that gives the skin itsbrown colour.Bergasol enables you to go brown faster,am as the days pass thedifference will become more obvious.Unfortunately,this special formulation isn′tCheap to prepare.So Bergasol is rather more expensive than ordinary sun tanoil.However,the price looks more attractive as you do.
Bergasoi?It makes you go brown faster
Protection Many people imagine that"cover-up"means you don′t get a tan.Nothing to show for yourholiday.
Not so.With"cover-up",you can get brown if you want to.The point of"cover-up"is to protect your skin from the harmful rays of the sunwhich,according to the experts,make your skinlook older.
That′s what Solex Cover-up is allabout--protection for your skin.It has a Sun Protection Factor 8,which makesit suitable for anyone.Find out how it works for you by consulting the SolexSun Chart.On sale wherever Solex is.With Solex Cover-up,you can tan asslowly as you like.As gently as you like.And with much less
chance of peeling.Your tan will lookbetter.Your skin will stay young longer.
Solex Gentle tan..,full protection
Why is Solex suitable for everyone?A.Its price is more attractive.
B.It can be used to relieve sunburn.
C.It can make the skin cells more active.
D.It has a mild protection factor.
考题
We take our skin for granted until it isburned ______ repair.A.beyond
B.for
C.without
D.under
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If you are writing or studying,it makes very much difference where the light comes from.People who use books and pens every day have to be especially careful about the way the light shines on their work.
Every house gets its light either from daylight through the windows--which is the best to use--or from lamps or electricity;but whichever kind of light it is,the way it shines toward our book or work is a matter of great importance to the eyes.
Take a book,sit with your back toward the window,and try to read.Your shadow（影子）falls all over the page and makes it almost as bad for your eyes as if you were in a dark room.
Now turnaround and face the window.The page is in the shadow again,while the bright light is in your eyes.
Try sitting with your right side toward the window.This is very well for reading,but if you were writing,the shadow of your hand would fall across the page and bother（打搅）you a little.
There is just one other way:sit with your left side to the window.Now everything is perfect for reading and for writing,too.
Whatever kind of light is in the room,the rule about the right to sit is always the same.
Which of the following is true?A.How the light shines on our work is of much importance.
B.The way the light shines on your work makes no difference.
C.We needn't care about where the light comes from.
D.People can write or study under a light that comes from any direction.
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单选题According to our calculation there is shortage of ten tons of oil compared with yoursI can’t sign the oil （）.A
sampleB
receiptC
recordD
quantity
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单选题We take our skin for granted until it is burned ____ repair.A
beyondB
forC
withoutD
under
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单选题- Must we send in our plan this week? -No,_____；you can send it in next week.A
you needn'tB
you mustn'tC
you can'tD
you shouldn't
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单选题There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.A
shownB
expressedC
appearedD
displayed
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单选题When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.A
the intensity of the lightB
checking the period and characteristics against the Light ListC
the color，because the buoy will have only a red or a green lightD
Any of the above can be used to identify the light
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单选题According to the passage, driving can be safe if ______.A
you are patientB
you obey all the traffic rulesC
you don’t cut another car offD
you wait in line at a red light
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问答题We can’t walk across the street when the traffic light is red.
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