8．A team led by a nurseryman （花圃工人） and his sons has raced against time for 20years，using branches from some of the world's biggest and most long-lasting trees to produce clones that could restore ancient forests and help fight climate change．
Now comes the most ambitious step of the project：getting the new trees into the ground．Plantings of two dozen clones from California's huge coastal redwoods will take place Monday in seven nations：Australia，New Zealand，Great Britain，Ireland，Canada，Germany and the U．S．
The lab-produced trees are genetic copies of three huge trees that were cut down in northern California more than a century ago．Remarkably，new branches still grow from the stumps （樹樁），including one known as the Fieldbrook Stump，which measures 35feet in diameter （直徑）．It's believed to be about 4，000years old．
"We need to reforest the planet．To do that，it just makes sense to use the largest，oldest trees that ever lived，"said David Milarch，co-founder of the non-profit Archangel Ancient Tree Archive．
Milarch and his sons Jared and Jake，who have a family-owned nursery，became concerned about the condition of the world's forests in the 1990s．They began traveling across the U．S．in search of"champion"trees that have lived hundreds or even thousands of years，believing that better genes make it possible for them to outlive others of their species．Scientific opinion varies on whether that's true，with skeptics saying the survivors may simply have been lucky．
The Archangel team says they've developed several methods of producing genetic copies．They focus on towering sequoias （高聳的水杉）and redwoods，considering them best suited to absorb great amounts of carbon dioxide （CO2），the greenhouse gas primarily responsible for climate change．
The challenge is to find places to put the trees，people to look after them and money to continue the project，Jared Milarch said．The group is funded through donations and doesn't charge for its clones．
"A lot of trees will be planted by a lot of groups on Arbor Day，but 90percent of them will die，"David Milarch said．"You can't plant trees and walk away and expect them to take care of themselves．"Those receiving Archangel redwoods have promised to care for them properly．

28．According to the text，the clonesC．
A．a(chǎn)re rather expensive
B．a(chǎn)re based on dead ancient trees
C．have been experimented for 20years
D．have been widely grown across the U．S．
29．To reforest the planet，David Milarch chooses the largest，oldest trees becauseB．
A．they are lucky treesB．they have better genes
C．they are easier to plantD．they look more beautiful．
30．David Milarch's team believes that genetic copies from sequoias and redwoodsA．
A．can take in more greenhouse gases
B．a(chǎn)re hard to survive for a long time
C．a(chǎn)re likely to cause climate change
D．may be a threat to existing plants
31．What is stressed by David Milarch in the last paragraph？C
A．The need of financial support．
B．The difficulty of finding places．
C．The importance of caring for trees．
D．The challenge of running his group．

分析 本文主要講述了David Milarch 和其研究團隊的人員利用有著好基因的樹來克隆新的樹以修復(fù)森林以及抵御全球變暖．

解答 28．C 細節(jié)題．根據(jù)文章內(nèi)容，A team led by a nurseryman （花圃工人） and his sons has raced against time for 20years，using branches from some of the world's biggest and most long-lasting trees to produce clones that could restore ancient forests and help fight climate change．一個由花圃工人和他的兒子帶領(lǐng)的團隊用來自世界上最大的以及最長的樹枝來克隆新的樹，以修復(fù)古老的森林以及幫助抵御氣候變化，該工作已經(jīng)持續(xù)有20年了，結(jié)合選項，故選C
29．B 細節(jié)題．根據(jù)文章內(nèi)容We need to reforest the planet．To do that，it just makes sense to use the largest，oldest trees that ever lived．．believing that better genes make it possible for them to outlive others of their species．由此可知，研究團隊使用最大的最好的樹是因為它們的基因好，對于克隆出好的樹有益處，結(jié)合選項，故選B
30．A 細節(jié)題．根據(jù)文章內(nèi)容，They focus on towering sequoias （高聳的水杉）and redwoods，considering them best suited to absorb great amounts of carbon dioxide （CO2），the greenhouse gas primarily responsible for climate change．由此可知，David Milarch的團隊認為高聳的水杉和紅木它們能更好的吸收二氧化碳等溫室氣體，以抵御全球變暖，結(jié)合選項，故選A
31．C 推理題．根據(jù)文章內(nèi)容，．"You can't plant trees and walk away and expect them to take care of themselves．"Those receiving Archangel redwoods have promised to care for them properly．由此可知，在我們種了樹之后，不能對它們放任不管，而是應(yīng)該精心的護理它們，讓它們茁壯的成長，結(jié)合選項，故選C

點評 題目涉及多道細節(jié)理解題，做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析，結(jié)合選項選出正確答案．推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案，切忌胡亂猜測，一定要做到有理有據(jù)．

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