21、Passage 221-50

　　If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan.

　　Sagan believes that before the earth's resources are completely exhausted it will be possible to change the atmosphere of Venus and so create a new world almost as large as earth itself. The difficulty is that Venus is much hotter than the earth and there is only a tiny amount of water there.

　　Sagan proposes that algae organisms, which can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.

　　When the algae have done their work, the atmosphere will become cooler, but before man can set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.

　　In the long run, the most difficult problem caused by population growth on earth will probably be the lack of__________.

　　A.food

　　B.oil

　　C.space

　　D.resources

　　22、 CarlSagan believes that Venus might be colonized from earth because__________.

　　A.it might be possible to change its atmosphere

　　B.its atmosphere is the same as the earth's

　　C.there is a good supply of water on Venus

　　D.the days on Venus are long enough

　　23、On Venus there is a lot of__________.

　　A.water

　　B.carbon dioxide

　　C.carbon monoxide

　　D.oxygen

　　24、 Algae are plants that can__________.

　　A.live in very hot temperatures

　　B.live in very cold temperatures

　　C.manufacture oxygen

　　D.all of the above

　　25、 Man can eventually land on Venus only when__________.

　　A.the algae have done their work

　　B.the atmosphere becomes cooler

　　C.there is oxygen

　　D.it rains there

　　26、请阅读Passage2。完成第26-55小题。

　　Passage 2

　　The World Cup has become the most streamed live sporting event the US has ever seen, as Americans tuned in to this year's tournament on their smart phones, tablets and computers in record numbers.

　　A surge of US interest in football this year has also led to record television audiences for broadcasts on ESPN and Uni-vision, the Spanish-language network. The US team's loss on Tuesday to Belgium averaged a 9.6 overnight rating on ESPN, according to Nielsen, the highest for any World Cup match the network has broadcast.

　　But a 50 per cent surge in live streaming compared with the previous record, set during the 2012 London Olympics, shows that the sport's appeal has grown particularly among younger, more digital, fans. Young people are energetic and fond of sporting, The World Cup is a great tournament of football, so they must be attractive. On the other hand, now the electronic devices are developing rapidly, more people have smart phones, tablets and computers. Then to watch the World Cup becomes much easier.

　　US viewers have so far watched nearly 30m hours of streaming video on ESPN's WoAd Cup website and apps, the network said, beating the previous record of 20.4m viewing hours during NBC's 2012 Olympics coverage. Univision has streamed 1.Sm hours since the start of the tournament.

　　Last week's USA vs. Germany match drew a record 1.Tm streaming viewers to ESPN at its peak, with streaming on Univision peaking at 747,000. Tuesday's USA vs. Belgium match peaked at 1.5m streams on ESPN and 680,000 on Univision.

　　In comparison, live streaming of January's Super Bowl peaked at l.lm.

　　While the elimination of the US team leaves a question mark over US fans' interest in the rest of the tournament, Univision's audience for non-US games has been robust.

　　Univision said its broadcast on Sunday of the Mexico vs. Netherlands match was the most-watched programme, of any kind, in US Spanish-language TV history, with an average 10.4m viewers. Its audiences have been the largest in cities with large Spanish-speaking populations, such as Miami, Los Angeles, Houston and New York.

　　With most matches being shown during business hours, Americans are increasingly turning to their devices, such as smart phones, tablets and computers to keep up with the tournament. Fifa,football's governing body, said US fans make up 20 percent of its global digital audience and are spending more time on its website and apps than fans in Brazil, Germany, England and France combined.

　　With different kind of electronic devices to watch World Cup, the number of audience becomes larger. The flood of demand caused some problems with ESPN's feeds, leading frustrated viewers to take to Twitter to complain about the match cutting out. That had also happened during the USA vs. Germany game.

　　The word "surge" (Line 1, Para. 2) may mean__________.

　　A.a sudden increase

　　B.an unexpected decrease

　　C.an abrupt change

　　D.a high wave

　　27、What can we conclude from the first two paragraphs?

　　A.The World Cup broadcast has broken its record in America.

　　B.Americans' interest in football has surged this year.

　　C.Smart phones and tablets become more and more popular.

　　D.Americans were not interested in The World Cup previously.

　　28、Why has Univision's audience for non-US games been robust?

　　A.They are fond of football without considering which country the team from.

　　B.They have little confidence in American football.

　　C.They are interested in other countries' football game.

　　D.They come from cities with large Spanish-speaking populations.

　　29、 Which of the following statements is Not true?

　　A.More Americans choose to watch the World Cup by smart phones, tablets and computers than before.

　　B.After the elimination of the US team, Americans still focus on non-US games.

　　C.Most matches of the World Cup are shown during business hours.

　　D.The large demand of the World Cup has a negative effect on ESPN's feeds.

　　30、 The best title of the passage may be__________.

　　A.World Cup Becomes Streaming Success for US TV

　　B.More Americans Become Interested in Football

　　C.Football Fans from America are Increasing

　　D.World Cup Play an Important Role in the US

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