Redwood trees are the tallest plants on the earth,reaching heights of up to 100 metersThey are also known for their longevity,typically 500 to 1000 years,but sometimes more than 2000 yearsA hundred million years ago,in the age of dinosaurs,redwoods were common in the forests of a much more moist and tropical North AmericaAs the climate became drier and colder,they declined to a narrow strip along the Pacific coast of Northern Califomia

The trunk of redwood trees is very strong and usually forms a single straight columnIt is covered with a soft barkThis bark can be pretty thick,well over two feet in the more mature treesIt gives the older trees a certain kind of protection from insects,but the main benefit is that it keeps the center of the tree harmless from moderate forest fires because of its thicknessThis fire resistant quality explains why the giant redwood grows to live that longWhile most other types of trees are destroyed by forest fires,the giant redwood actually prospers because of them

Moderate fires will clear the ground of competing plant life,and the rising heat dries and opens the ripe fruit of the redwoodreleasing many thousands of seeds onto the ground below

??? New trees are often produced from shoots,little baby trees,which form at the base of the trunkThese shoots grow slowly,fed by the root system of the “mother’’ treeWhen the main tree dies,the shoots are then free to grow as full treesforming a “fairy ring” of trees around the original treeThese trees,in turnmay give rise to more shoots,and the cycle continues

1.Why were redwood trees easier to find in the forests of North America millions of years ago?

AThe trees were taller and stronger

BThe soil was softer for seeds to develop

CThe climate there was warmer and wetter

DThe temperature was lower along the Pacific coast

2.Which of the following is a function of the tree bark as mentioned in the passage?

AIt allows redwood trees to bear seeds

BIt prevents redwood trees from attack by insects

CIt helps redwood trees absorb water in the air

DIt makes redwood trees more beautiful and appealing

3.Why do redwood trees grow to live that long according to the passage?

AThey have heavy and straight tree trunks

BThey are properly watered and catered to

CThey are more resistant to fire damage than other trees

DThey produce many young trees to maintain their life cycle

4.How does a “fairy ring’’ form according to the passage?

ABy killing an old tree????????????? ????????????? ????????????? ????????????? BBy connecting root systems

CBy inserting holes into old trees????????????? ????????????? DBy surrounding a mature tree

 

【答案】

1.C

2.B

3.C

4.D

【解析】

試題分析:文章介紹紅杉的生長習(xí)性,它怎么抵御昆蟲和森林大火的侵害,怎么能夠存活的那么久。

1.細節(jié)題:從文章第一段的句子:A hundred million years agoin the age of dinosaurs,redwoods were common in the forests of a much more moist and tropical可知在上百萬年前,北美的森林里面紅杉是很容易找到的,選C

2.細節(jié)題:從文章第二段的句子:It gives the older trees a certain kind of protection from insects,可知樹皮的功能是阻止紅杉被昆蟲侵害,選B

3.細節(jié)題:從第二段的句子:but the main benefit is that it keeps the center of the tree harmless from moderate forest fires because of its thicknessThis fire resistant quality explains why the giant redwood grows to live that long.可知紅杉能生長那么久,是因為它能夠抵御森林大火的侵害,選C

4.細節(jié)題:從文章最后一段的句子:When the main tree dies,the shoots are then free to grow as full treesforming a “fairy ring” of trees around the original treeThese trees,in turn,may give rise to more shoots,and the cycle continues.可知“fairy ring’’ 是通過包圍一顆成熟的樹形成的,選D

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