【正文】 y collect spaceborne garbage. The test, which was carried out this week, is widely believed to be the first successful demonstration of space cleanup technology, experts told CNN. And it symbolizes an early step toward solving what has already been a critical issue: junk in space. Millions of pieces of junk are turning around in orbit the result of 50 years of space travel and few regulations to keep space clean. At orbital speeds, even a small bit of paint crashing with a satellite can cause critical damage. Various panies have plans to send thousands of new satellites into lowEarth orbit, already the most crowded area. The RemoveDEBRIS experiment is run by a pany and researchers led by the U. K.39。s Surrey Space Center and includes Airbus, Airbusowned Surrey Satellite Technology Ltd. and France39。s ArianeGroup. Guglielmo Aglietti, the director of Surrey Space Center, said that an operational version of the RemoveDEBRlS technology would cast a net that remains fastened to the main satellite so the debris can be dragged out of orbit. It could target large pieces of junk, including dead satellites up to 10 meters long. The RemoveDEBRIS satellite will conduct a few more experiments in the ing months, including testing navigation features that could help guide the satellite to a specific piece of debris.Jonathan McDowell, an astrophysicist at the HarvardSmithsonian Center for Astrophysics, said the success of this week39。s experiment was exciting, but he cautioned against over publicizing it. There are still enormous barriers to clear before operational cleanup tasks are underway, he said, and the most discouraging is figuring out how to fund such projects. Aglietti, the Surrey professor who helped lead the RemoveDEBRIS project, said The challenge will lie in persuading the relevant authorities to sponsor these tasks. Aglietti said he hopes RemoveDEBRIS will conduct a few cleanup tasks per year, targeting the largest pieces of junk in the most crowded orbits.（1）What is the use of the RemoveDEBRIS satellite? A.Demonstrating space technology.B.Imitating a developing technique.C.Collecting wastes existing in space.D.Symbolizing great progress in space.（2）How does the RemoveDEBRlS satellite work? A.By throwing a net to take the junk from orbit.B.By fastening it to the main satellite tightly.C.By dragging satellites up to 10 meters long.D.By targeting large pieces of junk carefully.（3）What does the underlined word sponsor in the last paragraph probably mean? A.Acplish.B.Support.C.Oppose.D.Provide.（4）What39。s the best title for the text? A.The RemoveDEBRIS Project Is PerfectB.How RemoveDEBRIS Is Invented in the LabC.Why the RemoveDEBRIS Satellite Is InventedD.Satellite Collects Space Junk for the First Time【答案】 （1）C（2）A（3）B（4）D 【解析】【分析】本文是一篇說明文，介紹了“衛(wèi)星首次收集太空垃圾?！币环N名為“清除碎片”的實(shí)驗(yàn)清理設(shè)備成功地在一顆虛擬衛(wèi)星周圍撒網(wǎng)，模仿一種有朝一日可能收集太空垃圾的技術(shù)。 （1）考查細(xì)節(jié)理解。根據(jù)第一段中“...,imitating a technique that could one day collect spaceborne garbage.”模仿一種有一天可以收集太空垃圾的技術(shù)?？芍?，the RemoveDEBRIS衛(wèi)星的用途是收集太空中存在的廢物。故選C。 （2）考查推理判斷。根據(jù)第六段中的“...,said that an operational version of the RemoveDEBRlS technology would cast a net that remains fastened to the main satellite so the debris can be dragged out of orbit. It could target large pieces of junk, including dead satellites up to 10 meters long.“該公司表示，一種操作性版本的RemoveDEBRlS技術(shù)將會在主衛(wèi)星上撒網(wǎng)，這樣碎片就可以被拖出軌道。它可以瞄準(zhǔn)大塊的垃圾，包括長達(dá)10米的報(bào)廢衛(wèi)星?！笨芍?，RemoveDEBRlS衛(wèi)星是通過撒網(wǎng)把垃圾帶離軌道。故選A。 （3）考查詞義猜測。根據(jù)最后一段中的”Aglietti said he hopes RemoveDEBRIS will conduct a few cleanup tasks per year, targeting the largest pieces of junk in the most crowded orbits.“Aglietti說，他希望清理碎片的工作每年能進(jìn)行幾次，目標(biāo)是最擁擠軌道上最大的垃圾碎片?？芍?，“挑戰(zhàn)在于說服有關(guān)當(dāng)局贊助這些任務(wù)?！笨芍瑒澗€詞的意思是“支持”。故選B。 （4）考查主旨大意。根據(jù)第二段中的”The test, which was carried out this week, is widely believed to be the first successful demonstration of space cleanup technology, experts told CNN. And it symbolizes an early step toward solving what has already been a critical issue: junk in space.“專家告訴CNN，本周進(jìn)行的這次測試被廣泛認(rèn)為是太空清潔技術(shù)的首次成功演示。它象征著解決太空垃圾這一關(guān)鍵問題的第一步?？芍疚闹黝}是“衛(wèi)星首次收集太空垃圾”。故選D。 【點(diǎn)評】本題考點(diǎn)涉及細(xì)節(jié)理解，推理判斷，詞義猜測和主旨大意四個題型的考查，是一篇科技類閱讀，要求考生在捕捉細(xì)節(jié)信息的基礎(chǔ)上，進(jìn)一步根據(jù)上下文的邏輯關(guān)系，進(jìn)行分析，推理，概括和歸納，從而選出正確答案。8．閱讀理解 City trees grow faster and die younger than trees in rural forestry, a new study finds. Over their lifetimes, then, urban trees will likely absorb less CO2 from the air than forest trees. As we all know, the earth would be freezing or burning hot without CO2. However, CO2 is a greenhouse gas, meaning it traps energy from the sun as/heat. That makes temperatures near the ground rise. Human activities, especially the widespread burningof fossil(化石)fuels, have been sending extra greenhouse gases into the air. This has led to a rise in average temperatures across the globe. Studies had shown forests readily absorb CO2, but there hadn39。t been much data on whether city trees grow, die and absorb CO2 at the same rate as forest trees do. So some researchers decided to find out. To figure out how quickly trees were growing, researchers tracked their diameters (the width of their trunks) between 2005 and 2014. A tree39。s diameter increases as it grows, just as a person39。s waist size increases as they gain weight. About half the weight of a tree is carbon, research has shown. Most of the rest is water. Over the nine years39。 tracking, the researchers found city trees absorbed four times as much carbon from the air as forest trees. However, they were twice as likely to die. So over the lifetime of each type of tree, forest trees actually absorbed more CO2. City trees grew faster because they had less petition for light from their neighbors. In a forest，trees tend to grow close together，shading their neighbors. Street trees also benefit from higher levels of nitrogen (氮)in rainwater. Nitrogen helps plants grow. Waste gases from gasburning cars also contain nitrogen, thus enriching city air with nitrogen. Later