问题 选择题

下列选项中,不能说明生物适应环境的是

A.干燥的沙漠中仙人掌的叶变成刺状

B.绿色草丛中的蝗虫体色多为绿色

C.生活在极地的企鹅有厚厚的脂肪层

D.夏天的树林里空气凉爽

答案

答案:D

题目分析:生物必须适应环境才能生存,如干燥的沙漠中仙人掌的叶变成刺状,是为了适应干旱的环境,绿色草丛中的蝗虫体色多为绿色,是防止被敌害发现,同时便于捕食猎物,是对自身的一种保护,这是生物适应环境的一种现象,生活在极地的企鹅有厚厚的脂肪层,是为了适应寒冷的环境,故A、B、C都不符合题意;D、树林中的植物因为可以进行蒸腾作用,降低周围环境的温度,夏天的树林里空气凉爽,这是生物对环境的影响,故D符合题意。

单项选择题

You really do have to wonder whether a few years from now we’ll look back at the first decade of the 21st century—when food prices spiked, energy prices soared, world population surged, tornados plowed through cities, floods and droughts set records, populations were displaced and governments were threatened by the confluence of it all—and ask ourselves. What were we thinking How did we not panic when the evidence was so obvious that we’d crossed some growth, climate, natural resource and population redlines all at once "The only answer can be denial," argues Paul Gilding, an Australian environmentalist, in a new book called The Great Disruption. "When you are surrounded by something so big that requires you to change everything about the way you think and see the world, then denial is the natural response. But the longer we wait, the bigger the response required."
Gilding cites the work of the Global Footprint Network, an alliance of scientists, which calculates how many "planet Earths" we need to sustain our current growth rates. G. F. N. measures how much land and water area we need to produce the resources we consume and absorb our waste, using prevailing technology. On the whole, says G. F. N. , we are currently growing at a rate that is using up the Earth’s resources far faster than they can be sustainably replenished, so we are eating into the future.
This is not science fiction. This is what happens when our system of growth and the system of nature hit the wall at once. We are now using so many resources and putting out so much waste into the Earth that we have reached some kind of limit, given current technologies. The economy is going to have to get smaller in terms of physical impact.
We will not change systems, though, without a crisis. But don’t worry, we’re getting there. We’re currently caught in two loops: One is that more population growth and more global warming together are pushing up food prices, causing political instability in the Middle East, which leads to higher oil prices, thus to higher food prices and more instability. At the same time, improved productivity means fewer people are needed in every factory to produce more stuff. So if we want to have more jobs, we need more factories. More factories making more stuff make more global warming, and that is where the two loops meet.
But Gilding is actually an eco-optimist. As the impact o the imminent Great Disruption hits us, he says, "our response will be proportionally dramatic, mobilizing as we do in war. We will change at a scale and speed we can barely imagine today, completely transforming our economy, including our energy and transport industries, in just a few short decades. " We will realize, he predicts, that the consumer-driven growth model is broken and we have to move to a more happiness-driven growth model, based on people working less and owning less.

The author agrees with Gilding that

A.both growth and tapping of nature have reached their limits.

B.one way of breaking the loops is making better use of the technology.

C.the current situation is not as bad as the G. F. N. scientists state it.

D.improved productivity will eventually help raise the employment rate.

多项选择题