题目内容
（请给出正确答案）
Fly ash can partly take the place of ______.
A. paving material
B. cement
C. concrete
D. the coal by-product
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更多“Fly ash can partly take the pl…”相关的问题
What can be extracted from fine-powder fly ash？
A. Aluminum, silicon, and magnetic.
B. Additive.
C. Paving material.
D. Cement.
Which of the following is right？
A．So far, rockets with men have been to Other places.
B．Rockets with men can fly to other places farther away than the moon.
C．Perhaps one day rockets will be able to go to any place in space.
D．A plane can fly to the moon.
A．The helicopter can fly forwards, backwards, up, down, and sideways.
B．The helicopter can hover in the air.
C．The helicopter can land and take off from a flat roof.
D．The helicopter has a single-bladed rotor on its top.
The last paragraph suggests that______.
A. a modern computer won't be down
B. computers can take the place of humans
C. there will be great changes in computers
D. sometimes a computer may bring suffering to people
Why do some farmers refuse to move to emergency shelters？
A．They are lining up for trucks to take them to safety.
B．They want to watch the unusual volcano eruption.
C．They hope the government can provide some money.
D．They think volcanic ash is good to their crops.
根据以下内容回答题：
A volcanic eruption in Iceland has sent ash across northern Europe．Airlines have stopped or changed the flights across the Atlantic Ocean，leaving hundreds of passengers stuck in air-ports．
Grimsvoto is oDe of the largest and most active volcanoes in Europe．What makes Grimsvoto different is that it lies under a huge glacier(冰川)of ice up to 12 meters thick．The hot volcano heats up the ice above it，which then forms a layer of water between the glacier and the volcano．This layer of water puts pressure on the volcano，keeping it stable．As the water flows out from under the glacier，the pressure lifts．The lava(岩浆)from the volcano then comes up to the surface．This is exactly what happened today．
Now．airlines have to make changes to their flights SO as not to fly through the clouds of volcanic as．h．According to．KLM，one of Europe’s biggest airlines，airplanes cannot go under the cloud or over it．Going through the cloud can result in ash getting stuck in the airplane’s engines，causing damage to the plane．
The eruption has also caused problems for animals in Iceland．The volcano left ash and sharp，glass-like rocks all over the countryside．Farmers are keeping their animals inside to stop them from eating ash—covered grass or the sharp objects．
What makes Grimsvoto different from other volcanoes？ 查看材料
A.It is below-ice．
B.It lies under the sea．
C.It is the largest volcano．
D.Its lava affects the airlines．
A.take the place of
B.take place
C.instead
D.instead of
Far from being dead, the railways are very much alive. Modern railway lines give you a smooth, untroubled journey. Where else can you eat well, sleep in comfort, feel safe and enjoy the scene while you are traveling at speed at the same time？ And we are only at the beginning. For we have just entered the age of super-fast trains, trains traveling at 150 miles an hour and more. Soon we will be wondering why we spent so much on motorways we can’t use because we have not enough money to buy the oil and planes we can’t fly in for the same reason.
1. Some people think the railways are dead for many reasons EXCEPT that ____.
A. planes and motorcars have taken the place of trains
B. oil is expensive today
C. trains are slow
D. railways lose money
2. The writers idea seems to be that ______.
A. we can do without railways
B. trains have much in common with motorcars and planes
C. motorcars and planes are not as good as trains
D. trains are as good as motorcars and planes
3. According to the writer, which of the following is NOT the advantage of railways？
A. It is cheaper to travel by train than by plane.
B. Super-fast trains travel even faster than planes.
C. The railway station is usually at the center of a city.
D. A train carries more goods than a motorcar or plane does.
4. The writer thinks that the railways, far from being dead, are very much alive because ___________.
A. we can have a smooth and untroubled journey
B. we’ll not have enough money to fly everywhere
C. we can now travel in super-fast trains
D. all of the above
5. The best title for this passage may be ________.
A. The Best Choice: Train, Motorcar or Plane
B. The Dying Railways
C. Super-fast Trains in the Future
D. Not the End, But the Beginning
A.take out
B.take place
C.take away
D.take off
根据以下内容回答题：
No one knows for sure why birds migrate．One theory of migration says that ancient birds of the northern part of the earth were forced southward during the Ice Age，when ice covered large parts of Europe，Asia and North America．As the ice melted，the birds came back to their homelands，spent the summer，and then went south again in winter．Gradually，these comings and goings became habits，and birds now migrate though much of the ice has gone． Another theory proposes that the ancient home of all modern birds was the tropic areas．There lived so well that the region became overcrowded．Many species had to move northward．During the summer，these birds found plenty of room and food．In winter，however，food be-came scarce and they had to return to the south． A newer theory is that increasing daylight stimulates certain glands（腺）in the bird’s body and prepares it for migration．One scientist is able to make birds migrate in midwinter by expo-sing them for two months to artificial daylight．Recoveries of marked birds indicate that they fly north as soon as they are set free．The conclusion is that the urge to migrate is determined by changes in the bird’s body which take place under seasonal changes in the length of daylight． This theory would account for the fact that not all birds migrate at the same time．Each sDecies seems to have its own schedule．The theory would also account for the regular time and rou‘tes of migration．Birds arrive at a given place year after year．Unfavorable weather delays them only a few days．Total hours of daylight，rather than weather，start them on the way． How birds find their way to the same place year after year and why they follow their own Darticular route are still mysteries．They evidently do not follow known landmarks，for many young birds migrate alone without the help of experienced adults．
We can conclude from the first paragraph that__________ ．
A.during the Ice Age，the whole Europe was covered with ice
B.the south used to be the homelands of all birds
C.scientists can confidently explain why birds migrate now
D.migration of birds can be explained by the change of ice on earth
