Question

This morning, a Virgin Atantin 747 Jumbo Jet became the first commercial airplane to fly on biofuel. The short flight from London to Amsterdam used a blend of 20% babassu(棕榈) oil mixed with 80% conventional jet fuel.
What was really exciting about the flight was the fact that the engine did not have to be altered in any way for the biofuel to work While this is a great initial step in trying to reduce CO₂(carbon-dioxide)emissions(排放)from airplanes. there are a lot of hurdles (障碍)that still need to be overcome.
First and foremost, unlike the normal fuel used to run airplanes (known as Jet A),biofuel freezes at high altitudes. Also, Jet‘A’fuel burns consistently (at the same pace),which means it provides a safe and reliable fuel for long flights--engineers are not sure if biofuel will be able to do the same.
The biggest hurdle to a full biofuel switch is our ability to be able to grow enough crops that can be converted to biofuel. There are two concerns that scientists have in this matter – the first is that the land to grow the extra crops will come from clearing more of our forests and the second is that since it competes with what we eat, the price of food will go up.
However, Richard Branson of Virgin Airlines, envisions that if biofuel starts to replace oil on a greater basis, it will be manufactured from algae（藻类）produced in sewage treatment plants, not from food sources.
Birgin Airlines is not the only one trying to look for alternative fuel sources. Earlier this year, an Airbus A380 used another alternative fuel-a man-made mix of gas-to-liquid, in one of its four engines. The flight was tested by Rolls Royce (manufacturer of jet engines), in partnership with Shell (an oil company). Rolls Royce is also working with Air New Zealand on a similar project.
While a complete switch to alternative fuel may take years, it is very encouraging to see airlines, oil companies and airplane manufacturers all coming together to try to make it happen!

1. 1.
   ．Why does Virgin Airlines try to replace normal fuel with biofuel?
   1. A.
      To cut down the flight cost of the company
   2. B.
      To remove some hurdles for the biofuel to work
   3. C.
      To reduce CO₂ emissions from airplanes
   4. D.
      To test plane engines on biofuel
2. 2.
   ．Which is NOT true for a full biofuel switch of airplanes?
   1. A.
      Biofuel cannot run for long flights
   2. B.
      ．Biofuel cannot work at high altitudes
   3. C.
      ．Man has not enough land to grow extra crops for biofuel
   4. D.
      ．It’s not easy for sewage treatment plants to manufacture biofuel
3. 3.
   ．One of the hurdles to be overcome for a full biofuel switch is to          
   1. A.
      alter the engine for airplanes
   2. B.
      make biofuel burn consistently
   3. C.
      open more land to grow more crops
   4. D.
      develop sewage treatment plants
4. 4.
   ．We can infer from the last paragraph that          
   1. A.
      there is a long way to go for a complete switch to alternative fuel
   2. B.
      it won’t be long before alternative fuel comes into use
   3. C.
      airlines, oil companies and airplane manufacturers are reliable
   4. D.
      alternative fuel has a bright future
5. 5.
   ．Which of the following can best serves as the title of this passage?
   1. A.
      Biofuel-Alternative Fuel Sources
   2. B.
      The First Commercial Flight Powered by Biofuel
   3. C.
      How to Reduce CO₂ Emissions from Airplanes
   4. D.
      Vigin Airlines Trying to Alter Fuel Sources

Answer 1

CDBAB
试题分析：
1.C 细节题。由While this is a great initial step in trying to reduce CO2(carbon-dioxide)emissions(排放)from airplanes.可知C正确
2.D 细节题。由第三段可知，D项不正确。
3.B 细节题。由二，三两段可知，B项“使生物燃料持续燃烧”正确。
4.A 推断题。由最后一段可推出依然有很长一段路如果要让生物燃料替代其他能源。故选A
5.B 文章理解题。本文主要讲述了生物燃料的第一次应用与商业飞行。故选B
考点：考查科普类短文阅读
点评：文章主要讲了生物燃料的一次应用及相关待解决的问题。本文的难点在于科普类文章的词汇障碍，考生要学会从上下文的串联中去猜测词义或者利用构词法的知识来猜测具体的词义。也是以细节题的考查为主，推断题测试考生在阅读基础上的逻辑推理能力，要求考生根据文章所述事件的逻辑关系，对未说明的趋势或结局作出合理的推断；或根据作者所阐述的观点理论，对文章未涉及的现象、事例给以解释。考生首先要仔细阅读短文，完整了解信息，准确把握作者观点。