大學(xué)英語六級考試710分新題型全真模擬

內(nèi)容概要

根據(jù)2009年大學(xué)英語六級考試最新趨勢設(shè)計的8套模擬試卷，附聽力光盤、答題卡、聽力錄音稿和題目精解。

書籍目錄

大學(xué)英語六級考試模擬試卷一大學(xué)英語六級考試模擬試卷二大學(xué)英語六級考試模擬試卷三大學(xué)英語六級考試模擬試卷四大學(xué)英語六級考試模擬試卷五大學(xué)英語六級考試模擬試卷六大學(xué)英語六級考試模擬試卷七大學(xué)英語六級考試模擬試卷八大學(xué)英語六級考試模擬試卷九

章節(jié)摘錄

　　Non-ferrous metals　　Aluminum is shredded and ground into small pieces or crushed into bales．These pieces or bales are melted in an aluminum smelter to produce molten aluminum．By this stage the recycled aluminum is indistinguishable from virgin aluminum and further processing is identical for both．This process does not produce any change in the metal，SO aluminum can be recycled indefmitely．　　Recycling aluminum saves 95％of the energy cost of processing new aluminum．This is because the temperature necessary for melting recycled，nearly pure，aluminum is 600℃。while to extract mined aluminum from its ore requires 900 oc．To reach this higher temperature，much more energy is needed，leading to the high environmental benefits of aluminum recycling．Glass　　Glass bottles and jars are gathered via eurbside（路邊）coHection schemes and bottle banks．where the glass may be sorted into color categories．The collected glass cullet（碎玻璃）is taken to a glass recycling plant where it is monitored for purity and contaminants are removed．The cullet is crushed and added to a raw material mix in a melting furnace．It is then mechanically blown or mold．ed into new jars or bottles．Glass cuHet is also used in the construction industry for aggregate（集料）and glassphalt．Glassphalt is a road—laying material which comprises around 30％recycled glass．Glass can be recycled indefinitely as its structure does not deteriorate when reprocessed．

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