20．People often call the plastic bags"white pollution"．（71）B，it becomes the worst invention for the human．It is reported that it takes 100-200years to break down the plastic bags completely．However，a 16-year-old high-school Canadian student called Daniel Byrd discovered the way to break down the plastic bags!
The idea of the invention comes from his housework．（72）E．Every time，when he opens the closet，the plastic bags fly out．This makes him very angry．（73）A．With his teacher's help，he found that when he put the two germs（細菌） mixture up and that made the plastic bags break down quickly．
He made an experiment first．He put some earth germs and plastic bags together．After 12weeks，he found the plastic bags had been broken down．（74）C．The experiment also showed that the plastic bags could be broken down in three months．And they only gave out some water and little carbon dioxide （CO2）．
Now Byrd has got 30thousand dollars from his invention．（75）D He has also got a lot of award from many universities．
A．So he thinks how to deal with these plastic bags
B．Because it is hard to break down
C．Then he made another experiment
D．He wants to go to college with his money
E．He always helps her mother do the housework

分析 這篇短文主要講述環(huán)保問題．文章介紹人們常常把塑料袋的"白色污染"，而且很難被化解，加拿大的一名高中生丹尼爾通過實驗發(fā)明了一種能讓塑料袋化解的辦法．這也讓他獲得了許多獎金．

解答 答案：71．B  細節(jié)推理題．根據(jù)上下文People often call the plastic bags"white pollution"．人們常常把塑料袋的"白色污染"．It is reported that it takes 100-200 years to break down the plastic bags completely．據(jù)悉，這需要100-200年才能完全分解塑料袋．可知結(jié)合選項，應(yīng)是說因為它很難化解，所以叫做"白色污染"．故選B．
72．E   細節(jié)推理題．根據(jù)前文The idea of the invention comes from his housework．本發(fā)明的想法來自于他的家務(wù)．可知結(jié)合選項，應(yīng)是說丹尼爾經(jīng)常幫助媽媽做家務(wù)．故選E．
73．A   細節(jié)推理題．根據(jù)前文when he opens the closet，the plastic bags fly out．This makes him very angry．當他打開壁櫥，塑料袋飛出去．這使他很生氣．可知結(jié)合選項，應(yīng)是說由于塑料袋到處飛，因此丹尼爾考慮如何解決塑料袋問題．故選A．
74．C   細節(jié)推理題．根據(jù)下文The experiment also showed that the plastic bags could be broken down in three months．實驗還表明，塑料袋可以在三個月內(nèi)被分解．可知結(jié)合選項，應(yīng)是說丹尼爾做的另一個實驗也表明塑料袋可以在3個月內(nèi)化解．故選C．
75．D  細節(jié)推理題．根據(jù)上下文Now Byrd has got 30thousand dollars from his invention．（75）He has also got a lot of award from many universities．現(xiàn)在Byrd從他的發(fā)明獲得了3萬美元．（75）____，他也得到了許多大學的獎勵．可知結(jié)合選項，應(yīng)是說丹尼爾用發(fā)明得來的錢上了大學，同時在大學里也得到了許多獎金．故選D．

點評 做題時首先對原文材料迅速瀏覽，掌握全文的主旨大意．其次，細讀題材，各個擊破．掌握全文的大意之后，細細閱讀材料后的問題，弄清每題要求后，帶著問題，再回到原文中去尋找、捕獲有關(guān)信息．

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