In the rainforest, some superior trees are replacing others in a-考呗网题库移动版

单选题 In the rainforest, some superior trees are replacing others in an extremely slow process.

参考答案G

解析:In the rainforest,some superior trees are replacing others in an extremely slow process．
在热带雨林里，一些更好的树种将在极其缓慢的过程中取代其他树种。
由题干中的superior trees定位到原文画线处。
[G]段提到热带雨林中树木的多样性可能是由于一些树种比其他树种更好，它们正处于从其他树种那里接管雨林的过程中，但是这个过程可能要经历几个世纪。题干中的replacing对应原文中的taking over,故选[G]。

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单选题The unfound, uncollected and unexamined treasures account for three fourths of the rainforest's total worth.

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单选题Questions are based on the following passage.
Mark Ramirez, a senior executive at AOL, could work in the most comfortable leather chair, if he wanted. No, thanks. He prefers to stand most of the day at a desk raised above stomach level. "I've got my knees bent; I feel totally alive," he said. "It feels more natural to stand."
In the past few years, standing has become the new sitting for 10 percent of AOL employees at the firm's Virginia campus, part of a standing ovation (热烈欢迎) among accountants, programmers, telemarketers and other office workers across the nation. GeekDesk, a California firm that sells $ 800 desks raised by electric motors, says sales will double this year.
Standers give various reasons for taking to their feet: It makes them feel more focused, prevents doze, and makes them feel like a general even if they just push paper. Former defense secretary Donald Rumsfeld works standing up. So does novelist Philip Roth.
But unknown to them, a debate is spreading among some experts and public-health researchers about whether all office workers should be encouraged to stand--to save lives.
Doctors point to surprising new research showing higher rates of obesity, heart disease and even death among people who sit for long stretches. A study earlier this year in the American Journal of Epidemiology showed that among 123,000 adults followed over 14 years, those who sat more than six hours a day were at least 18 percent more likely to die during the time period studied than those who sat less than three hours a day.
"Every rock we turn over when it comes to sitting is stunning," said Marc Hamilton, a leading researcher on inactivity physiology at the Pennington Biomedical Research Center in Louisiana. "Sitting is hazardous. It's dangerous. We are on the tip of a major revolution. " He calls sitting "the new smoking".
Not so fast, other experts say. Standing too much at work will cause more long-term back injuries.
Incidences of varicose veins (静脉曲张) among women will increase. The heart will have to pump more.
Hedge, the Cornell professor, isn't a fan of all this standing. "Making people stand all day is dumb," he said.
The sensible and most cost-effective strategy, he said, is to sit in a neutral posture, slightly leaned, with the keyboard on a tray above the lap. This position promotes positive blood flow. Workers should occasionally walk around, stretch and avoid prolonged periods at the desk. The key, he said, is movement, not standing.
What may be the reason for Mark Ramirez's standing to work most of the day?

A．The desk is raised above his stomach.
B．The chair is uncomfortable.
C．He wants to be close to nature.
D．It can keep him completely alive.

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单选题
What does the author intend to show by the examples of Donald Rumsfeld and Philip Roth?

A．There are a lot of people standing when working.
B．Donald Rumsfeld and Philip Roth are generals.
C．Standing makes them feel more focused.
D．Both of them are experts in standing.

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