A.It helps an airplane function normally. |
B.Its ability to avoid disasters is amazing. |
C.It is necessary equipment on an airplane. |
D.The idea for its design comes from a comic book. |
A.the scene of the crash and the damage |
B.data for analyzing the cause of the crash |
C.the total number of passengers on board |
D.homing signals sent by the pilot before the crash |
A.make them easily identified |
B.meet the international standards |
C.caution people to handle them with care |
D.distinguish them from the color of the plane |
A.They have stopped sending homing signals. |
B.They were destroyed somewhere near Brazil. |
C.There is an urgent need for them to be restructured. |
D.There is still a good chance of their being recovered. |
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A.Rewarding children for sharing |
B.Forcing children to share |
C.Allowing children to share precious things willingly |
D.Allowing children to share what they don’t need |
A.have an opposite effect | B.serve as a push |
C.cause anger | D.a(chǎn)void taking things back |
A.they regret what they did | B.it’s not their own choice |
C.Ellie is not as sad as Doggie | D.they like to share with a real person |
A.parents will never find a way to get children to share toys |
B.a(chǎn) gift should be given to make up for children’s sacrifice |
C.children pretend to be generous when they are being observed |
D.making difficult choices may influence sharing behavior |
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A.produce 6 percent more waste |
B.can be made biodegradable more easily |
C.can be used as a source of food |
D.save 40 percent of the energy |
A.Paper bags | B.Plastic bags |
C.Biodegradable plastic bags. | D.Cloth bags. |
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A.They eat more food. | B.They eat less nutritious foods. |
C.They eat cheaper fruits. | D.They eat cheaper vegetables. |
A.a(chǎn)re damaging a great part of their agricultural land |
B.will play a great role in feeding the growing world population |
C.a(chǎn)re spending lots of money increasing agricultural production |
D.will not be so seriously affected by food prices as rich nations |
A.Improving the growing methods. |
B.Finding more agricultural land. |
C.Preventing governments' involvement. |
D.Improving farmers' living conditions. |
A.Agriculture means difficulty and sadness. |
B.Food prices will go down in the near future. |
C.It's almost impossible to feed 9,000,000,000 people by 2050. |
D.Both rich and poor countries should take agriculture seriously. |
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A.a(chǎn)ttracting more public attention |
B.shutting down the “myspace.com” |
C.learning different ways to try other sites |
D.recognizing and getting away from them |
A.everybody you meet online isn’t honest and reliable |
B.it is not acceptable to post a photo of a friend online |
C.it is not safe to chat with grown-ups on the website |
D.only you and your friends can view your personal profile |
A.A thing that you can have two choices. |
B.An unpleasant task that tests one’s ability. |
C.A possibility of something happening. |
D.An illegal plan for making money. |
A.Personal Safety. | B.Web Safety for Teens. |
C.Web Hackers in the past. | D.Predators’ Tricks. |
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A.draw pictures | B.change the typeface | C.switch on the computer | D.colour the key points |
A.it’s good to study under the covers for some time every day |
B.you cannot skip the difficult questions and go on to the rest |
C.you can have some snacks and drink enough water to refresh yourself in exams |
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A.had no clue about it | B.were a cold fish | C.knew it was cold | D.were familiar with |
A.Power down | B.dream on | C.eat brain food | D.make a smart move |
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A.Because small pieces of food would fall down to the floor. |
B.Because weightless pieces of food might make trouble when they travel around. |
C.Because they haven’t enough food for longer trips. |
D.Because astronauts don’t want to waste food. |
A.walk just as they do on the earth. |
B.not eat anything because it’s dangerous. |
C.control the spaceship when they are sleeping. |
D.not litter small things or it will make trouble. |
A.Because he thinks it is comfortable to sleep in that way in space. |
B.Because he doesn’t want to touch any controls when he sleeps. |
C.Because the instruments of the spaceship are easily broken. |
D.Because he is afraid that the seat will move. |
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A.current scientific knowledge about faults |
B.the San Andreas and the New Madrid faults |
C.the causes of faults |
D.the New Madrid fault in Missouri |
A.a(chǎn) vertical fault |
B.a(chǎn) horizontal fault |
C.a(chǎn) more serious fault than the San Andreas fault |
D.responsible for forming the Mississippi River |
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B.Vertical faults are more dangerous than horizontal faults |
C.The volcanoes that caused the New Madrid fault are still alive |
D.A lot of people would die if the 1811 New Madrid earthquakes happened today |
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A.work rapidly | B.be large and expensive |
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A.larger and more expensive | B.smaller and cheaper |
C.more difficult to use | D.to work more slowly |
A.writing letters | B.playing games |
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A.check the list of goods and materials that are kept in the store house |
B.play games for pleasure |
C.talk with their friends |
D.write letters |
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