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Pycnandra acuminate (喜树) is a rare tree ...

    Pycnandra acuminate (喜树) is a rare tree native to New Caledonia that has the rare ability to collect heavy metals like nickel () from the ground. The liquid circulated in its body is blue-green and reportedly contains up to 25% nickel.

In general, trees and heavy metals like nickel don’t really go well together. But Pycnandra acuminata make them live together. And that’s what makes Pycnandra acuminata so special. It sucks out normally poisonous levels of heavy metals from the soil and store them in its trunk, leaves and seeds.

The evolution of Pycnandra acuminate is believed to have occurred over millions of years, but scientists have yet to identify a universal principle of nickel intake and storage. The reason why such trees have formed the way of absorbing metals is also up for debate.

The most popular theory states that the concentration of nickel protects such trees from leaf-chewing insects. And studies have shown that nickel accumulated by these trees indeed harms many insects though some have developed a high tolerance to it. Another theory says nickel has effects of resisting bacteria, which protects the trees from various diseases. However, these theories are all just theories.

One thing that has been proven is the ability of Pycnandra acurninata to clean the soil with poisonous materials caused by human activity. There’s also clear potential for collecting heavy materials like nickel in these kinds of soils that will bring a few profits by conventional ways of mining. People can collect minerals contained in such soils from the blue-green trees

Unfortunately, Pycnandra acuminata is is recently in a bad situation. Human activity in forests of New Caledonia has made Pycnandra acuminata in danger. Consequently, probably fewer than several hundred trees of this kind have remained as a result of the reduction of our forests.

1.What do we know about Pycnandra acuminata?

A.It has a blue-green color due to metals collected.

B.It is able to collect some heavy metals from the ground.

C.It sucks out a great deal of poisonous underground water.

D.It tends to grow in the soil with plenty of poisonous liquid.

2.What do the theories in paragraph 4 say about Pycnandra acuminata?

A.It indeed protects many insects.

B.It stores most nickel in its roots.

C.It protects itself through the concentration of nickel.

D.It makes its surrounding plants suffer from diseases.

3.What does the author mainly want to express in the last paragraph?

A.Pycnandra acuminata is in danger.

B.Forests are to blame for the reduction of trees.

C.Forests are decreasing as a result of human activity.

D.Pycnandra acuminata is under the protection of people.

4.In which section of a magazine is this next most likely to appear?

A.Bacteria and disease. B.Health and life.

C.Fashion and entertainment. D.Man and nature.

 

1.B 2.C 3.A 4.D 【解析】 本文是说明文。文章主要介绍了可以从土壤中吸收重金属的树木,中文名为“喜树”。 1.细节理解题。根据第一段第一句Pycnandra acuminate (喜树) is a rare tree native to New Caledonia that has the rare ability to collect heavy metals like nickel (镍) from the ground.“尖刺五加是一种罕见的树木,原产于新喀里多尼亚,具有罕见的能力,从地面收集重金属,如镍。”和第二段In general, trees and heavy metals like nickel don’t really go well together. But Pycnandra acuminata make them live together. And that’s what makes Pycnandra acuminata so special. It sucks out normally poisonous levels of heavy metals from the soil and store them in its trunk, leaves and seeds.“一般来说,树木和像镍这样的重金属不能很好地结合在一起。但是Pycnandra acata让它们住在一起。这就是Pycnandra acata如此特别的原因。它从土壤中吸收通常有毒的重金属,并将它们储存在树干、树叶和种子中。”可知,“喜树”能吸收土壤里的重金属,比如镍。故选B。 2.推理判断题。根据第四段第一句The most popular theory states that the concentration of nickel protects such trees from leaf-chewing insects.“最流行的理论认为,镍的浓度可以保护这些树不受啃叶昆虫的侵害。” 和第三句Another theory says nickel has effects of resisting bacteria, which protects the trees from various diseases.“另一种理论认为,镍具有抗菌作用,可以保护树木免受各种疾病的侵袭。”可知,从理论上来说,“喜树”通过收集来的镍杀死昆虫和细菌来保护自己。故选C。 3.推理判断题。根据最后一段第一、二句Unfortunately, Pycnandra acuminata is is recently in a bad situation. Human activity in forests of New Caledonia has made Pycnandra acuminata in danger.“不幸的是,最近Pycnandra acata的情况很糟糕。人类在新喀里多尼亚森林的活动已经使九喜树处于危险之中。”可知,不幸的是,最近“喜树”的生存情况很糟糕。人类在新喀里多尼亚森林的活动已经使“喜树”处于危险之中。故选A。 4.推理判断题。文章主要介绍了可以从土壤中吸收重金属的“喜树”。这种树木因为受人类活动的影响处于濒危状态,故这篇文章最有可能出现在一本杂志的“人与自然”专栏。故选D。
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    Remember Vitainwater’s “free of rolling screen for a year” challenge that dared people to be free from smart phones for a whole year will win $ 100,000? Well, Elana Mugdan, a New York woman, has been into it for eight months, and just four months away from claiming grand prize.

Vitaminwater made news headlines last December when it announced its unique challenge. Thousands of people applied to be chosen as the perfect candidate to spend a year without touching their smart phones, but in the end, the only person who got to try and survive for an entire year without a handheld smart phone was Elana Mugdan, a 29-year-old fiction writer from Queens, New York. Eight months into the challenge, she claims it has been a free and eye-opening experience that shows her just how dependent she becomes on her smart phone. Even though there are times when she misses her handheld smart phone, she plans to go on living without it even after the challenge ends, because she really doesn’t want to go back to days when she abused it, wasted time, stayed up all hours of the night on it, and was obsessed with social media.

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Another time, her car’s “check engine” light turned on while she was driving in an unfamiliar area at night. She couldn’t use her phone’s GPS location feature, r even check what the light meant on Google or find a nearby car repair shop. Still, she learned to overcome these situations. And now she claims the last eight months of phone-free life have been one of the best adventures of her life and that she’ll keep it for another four months.

1.What’s the challenge “free of rolling screen for a year”?

A.People free from smart phones can live a richer life.

B.People living a telephone-free life can be awarded every year.

C.People living without computers for a year will win grand prize.

D.People spending a year free from smart phones will get a reward.

2.Which phrase can replace the underlined part “obsessed with” in paragraph 2?

A.satisfied with B.accustomed to

C.addicted to D.popular with

3.What does Elana Mugdan mainly want to express in paragraph 3?

A.It’s fantastic to have someone to help her all the way.

B.It’s unimaginable to lose her phone number on the way.

C.It’s unnecessary to refer to information with a smart phone.

D.It’s difficult to get out of the trouble without a smart phone.

4.What can we learn about Elana Mudgan?

A.She couldn’t live without a smart phone.

B.She finds no one can help her in the adventure.

C.She has not won the grand $ 100,000 prize yet.

D.She used to use her smart phone to write fiction.

 

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