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For its supporters, the idea of growing single-celled algae on exhaust gas piped from power stations is the ultimate in recycling. For its detractors, it is a mere pipe dream. Whoever turns out to be right, though, it is an intriguing idea: instead of releasing the carbon dioxide produced by burning fossil fuels into the atmosphere, why not recapture it by photosynthesis? The result could then be turned into biodiel (since many species of algae store their food rerves as oil), or even simply dried and fed back into the power station. Of cour, if it were really that easy, someone would have done it already. But although no one has yet commercialid the technology, veral groups are trying.
One of them is GS CleanTech, which has developed a bioreactor bad on a patent held by a group of scientists at the Ohio Coal Rearch Centre, at the University of Ohio. The GS CleanTech bioreactor us a parabolic mirror to funnel sunlight into fibre-optic cables that carry the light to acrylic “glow plates” inside the reactor. The diffu the light over vertical sheets of polyester that form the platform on which the algae grow. Eventually the polyester
is unable to support the weight of the algae, and they fall off into a collection duct positioned underneath.
GreenFuel Technologies, bad in Cambridge, Massachutts, has a different approach. Its reactor is compod of a ries of clear tubes, each with a cond, opaque tube nested inside. This arrangement makes it possible to bubble the exhaust gas down through the outer compartment and then bubble it back up through the opaque middle. The bubbling gas caus turbulence and circulates the algae around the reactor. The constant shift between light and darkness as the algal cells circulate increas the amount of carbon that they fix, probably by promoting chemical reactions that occur naturally only at night.
A preliminary test of GreenFuel's reactor design, which was performed at the Massachutts Institute of Technology's campus power plant, suggested that it can remove 75% of the carbon dioxide from a power station's exhaust. A more rious test is now being carried out by Arizona Public Service, that state's power utility, at its Redhawk plant. Another test is planned in Louisiana.
夏日沙滩GreenFuel claims that over the cour of a year, a hectare (2.5 acres) of its reactors should be able to produce 30,000 litres (8,000 American gallons) of oil, which could be ud as biodiel, and enough carbohydrates to be fermented into 9,000 litres of ethanol, which can be ud as a substitute for petrol.
There is, of cour, no free lunch. As Rob Carlson of the University of Washington points out, if money is to be made lling products made from exhaust gas, then that gas goes from being waste matter to being a valuable resource. Far from giving it away, power companies might even start charging for it. That would, indeed, be a reversal of fortune.
1．The word “intriguing” (Line 3, Paragraph 1) most probably means_____
[A] challenging.
[B] promising.
[C] complicated.
[D] alluring.鲜于璜碑
2. Which one of the following statements is TRUE of the bioreactor developed by GS CleanTech?
[A] No exhaust gas is ud in this bioreactor.
[B] The “glow plates” are ud to conduct the sunlight.
[C] Sunlight comes into the fibre-optic cables through holes in the parabolic mirror.
[D] Photosynthesis is carried out by the algae in the collection duct.
3．The collection duct positioned underneath is ud to_____
[A] hold the vertical sheets of polyester that fall off.
[B] substitute the platform on which the algae grows.
神凤[C] obtain the overweight algae.
[D] take the place of polyester after light is diffud on it.
4. The approach developed by the GreenFuel Technologies is different from that by GS CleanTech in that_____
[A] there is no photosynthesis in the reactor of GreenFuel Technologies.
[B] the light ud for photosynthesis is produced by the reactor itlf.
[C] the algal cells fix carbon in the process.
[D] the exhaust gas acts as the motive force.
5．The reactors of GreenFuel could produce the following fuels except_____
[A] biodiel.
[B] ethanol.手机悬浮球
[C] alcohol.
[D] fossil fuel.
怎么打省略号篇章剖析：
这篇文章讲述了绿色燃料的生产情况。第一段讲述了人们希望可以利用光合作用来生成燃料；第二、三段讲述有两家公司都在生产绿色燃料，但是使用了技术不同；第四、五段讲述绿色燃料开发使用的地点和规模；第六段讲述将来电力公司可能会对绿色燃料实行收费。
词汇注释：二年级数学小论文
detractor n. 恶意批评者 pipe dream 白日梦
biodiel n. 生物燃料 parabolic mirror n. 抛物柱面镜
acrylic adj. 丙烯酸的 duct n. 管
carbohydrate n. 碳水化合物 ferment v. 发酵
ethanol n. 乙醇; 酒精
难句突破：
(1) The constant shift between light and darkness as the algal cells circulate increas the amount of carbon that they fix, probably by promoting chemical reactions that occur naturally only at night.
[主体句式] The constant shift as the algal cells circulate increas …
行英语
[结构分析] 这是一个复合句，as引导的是时间状语从句，that引导的是定语从句修饰carbon， by promoting…作方式状语。
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