A.carried researches to space |
B.a(chǎn)ssembled the Robonaut 2 at the ISS |
C.brought supplies to the ISS |
D.went on a spacewalk |
A.improving | B.ending | C.changing | D.testing |
A.Discovery completed 39 missions during its two decades of space travel. |
B.The ISS is a big project and six researchers live on the station. |
C.American space exploration will focus on longer missions. |
D.The shuttles Endeavor and Atlantis will make their last missions next month. |
A.people’s opinions of Discovery’s retirement |
B.the government’s concern about the shuttles’ future |
C.the shuttles’ final homes after retirement |
D.museums’ great interest in the retired shuttles |
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A.the temperature of warm water drops faster than that of cold water |
B.warm water is heavier than cold water |
C.warm water has the same temperature as cold water |
D.warm water is not as useful as cold water |
A.late in the 19th century | B.early in the 20th century |
C.three years ago | D.late in the 20th century |
A.cold water freezes first |
B.warm water turns into ice before cold water |
C.warm water and cold water freeze at the same time |
D.much of cold water is changed into air. |
A.Because some of the warm water turns to vapor, the amount(數(shù)量) becomes less than that of cold water. |
B.Because warm water is lighter than cold water. |
C.Because the temperature of warm water is lower than that of cold water. |
D.Because cold water freezes with more difficulty than warm water. |
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A.different | B.the same |
C.not like each other | D.like each other |
A.some teachers didn’t teach students to think in English |
B.teachers never gave the students the way of learning English |
C.students didn’t remember the way teachers taught them |
D.teachers didn’t want their students to think in English |
A.Chinese students | B.English students |
C.Chinese teachers | D.English teachers |
A.You must think in English all the time. |
B.You should always translate English into Chinese. |
C.After speaking English for a long time, you may probably think in English naturally(自然地). |
D.The best way of learning English is to live in America. |
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A.children like to do homework in the kitchen |
B.some families can't afford a bigger property |
C.only a few families have housing problem |
D.people are satisfied with their living condition |
A.most families don't have enough money yet |
B.no family could afford a three - bedroom home |
C.it is common to live in a three - bedroom home |
D.the price of a bigger property is still acceptable |
A.young couples should live in a two - bedroom home |
B.families with three or so children couldn't afford a home |
C.parents should buy houses for their grown - up children |
D.some grown - up children couldn't afford a separate home |
A.House prices are falling down everywhere. |
B.People are able to buy a home of correct size. |
C.The house prices in London has not fallen down. |
D.The North East is now an area suitable to live in. |
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A.American smokers ought to try ecigarettes. |
B.Americans have different opinions about ecigarettes. |
C.Every kind of cigarettes should be forbidden in America. |
D.Most of the Americans don’t like ecigarettes. |
A.a(chǎn)re much safer than common cigarettes |
B.a(chǎn)re popular among people who want to quit smoking |
C.will take the place of traditional cigarettes |
D.a(chǎn)re produced in a safer way by manufacturers |
A.Most Americans are familiar with them. |
B.They are a good choice as there is no nicotine. |
C.They produce a water vapor that can’t be seen. |
D.Most people buy them on the Internet. |
A.Negative | B.Supportive | C.Doubtful | D.Indifferent |
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A.is being used by more and more people in the office |
B.will take the place of desktops sooner or later |
C.is specially designed for people who like playing computer games |
D.can be used for both work and entertainment purposes |
A.becoming smaller |
B.becoming more important |
C.becoming more popular |
D.becoming better |
A.huge display screen laptops are very cheap |
B.small display screen laptops are not on sale yet |
C.they can see their drawings more clearly |
D.they also want to play computer games |
A.That laptops can only be used for one year. |
B.That laptops are not as good as desktops. |
C.That the prices for laptops are too high. |
D.That laptops may have problems which cannot be fixed. |
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A.Ways to reduce the costs of building dams. |
B.Steps to improving water use management. |
C.Measures to deal with worldwide water shortages. |
D.Approaches to handling the pressure on water supply. |
A.much of the world's water is available for use |
B.people in high rainfall countries feel lucky |
C.the costs of water redistribution should be considered |
D.water can be easily carried through pipes across the world |
A.water supply and increasing population |
B.water shortages and environmental protection |
C.water redistribution and wildlife protection |
D.water use management and agriculture |
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A.They tried to get crops and paper |
B.They needed other products |
C.They wanted to raise farm animals |
D.They aimed to get three major resources. |
A.reflect more heat into the atmosphere |
B.bring about high rainfall throughout the world |
C.rarely cause the temperature to drop lower than 16℃ |
D.reduce the effect of heat from the sun on the earth |
A.We will lose much more than we can gain. |
B.Humans have begun destroying rainforests. |
C.People have a strong desire for resources. |
D.Much carbon dioxide comes from burning rainforests. |
A.we can get enough resources without rainforests |
B.there is great medicine potential in rainforests |
C.we will grow fewer kinds of crops in the gained land |
D.the level of annual rainfall affects wind patterns |
A.How to Save Rainforests |
B.How to Protect Nature |
C.Rainforests and the Environment |
D.Rainforests and Medical Development |
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