更多"We tend to think of memory as uniqu"的相关试题:
[填空题]We tend to think of memory as unique to animals. But it isn’t. Plants also have a form of memory. Yes: they, too, are shaped by what happens to them, and alter their responses to future events based on their experiences in the past.
For example, like all plants, wild tobacco, (also called Nicotiana sylvestris) can’t move to escape from its enenfies--the caterpillars (毛虫) and other animals that enjoy eating its leaves. It can, however, act to stop them. It can detect damaged leaves; in response, it produces nicotine. The nicotine travels from the roots, through the sap (树液) and into the leaves~ Nicotine apparently doesn’t taste good: caterpillars fed on leaves from plants that recently experienced damage--and so are high in nicotine--eat much less than caterpillars fed on leaves from previously undamaged plants.
But here’s the interesting part. Tobacco plants attacked for the first time take longer to mount their defense than tobacco plants that have previously experien
[填空题]
When we think of green buildings, we tend to think of new ones—the kind of high-tech, solar-paneled masterpieces that make the covers of architecture magazines. But the U.S. has more than 100 million existing homes, and it would be (1) wasteful to tear them all down and (2) them with greener versions. An enormous amount of energy and resources went into the construction of those houses. And it would take an average of 65 years for the (3) carbon emissions from a new energy-efficient home to make up for the resources lost by destroying an old one. So in the broadest (4) , the greenest home is the one that has already been built. But at the same time, nearly half of U.S. carbon emissions come from heating, cooling and (5) our homes, offices and other buildings. "You can’t deal with climate change without dealing with existing buildings," says Richard Moe, the president of the National Trust.
With some (6)
[单项选择]We tend to think of these people as unreliable, but that is not the __________.
A. case
B. situation
C. fact
D. circumstance
[填空题]Scientists think that we should blame the virus of flu all on wild birds.
[单项选择]When we think about happiness, we usually think of something extraordinary, a peak of great delight--and those peaks seem to get rarer the older we get.
For a child, happiness has a magical quality. I remember making hide outs in newly cut hay, playing cops and robbers in the woods, getting a speaking part in the school play. Of course, kids also experience lows, but their delight at such peaks of pleasure as winning a race or getting a new bike is unreserved.
For teenagers, or people under twenty, the concept of happiness changes. Suddenly it’s conditional on such things as excitement, love, and popularity. I can still feel the agony of not being invited to a party that almost everyone else was going to. But I also recall the great happiness of being invited at another event to dance with a very handsome young man.
In adulthood the things that bring great joy--birth, love, marriage--also bring responsibility and the risk of loss. Love may not last, sex isn’t alway
A. taking everything one has for granted
B. lack of freedom to love and be loved
C. lack of company of friends
D. ignoring the choices one is given in life
