阅读理解
Everybody hates rats. But rats may soon be man's new best friends.
What
happens after an earthquake? We send in rescue (援救) dogs. Why? Because they can smell
people. Dogs save lives. They help rescuers to find living people. But dogs are
big and they can't get into small space. So now a new research project is using
a smaller animal to save lives: the rat.
How
does it work? First, the rat is trained to smell people. When this
happens, the rat's brain gives a signal. This is sent to a small radio on its
back, and then the rescuers follow the radio signals. When the rat's brain
activity jumps, the rescuers know that someone is alive. The rat has smelled
that person.
Although there are already robots which can do this job, rats are
better. "Robots' noses don't work well when there are other smells around.
Rats are good at that," says a scientist. Rats can also see in the dark.
They are cheaper and quicker to train than dogs, and unlike robots, they don't
need electricity.
The "rat
project" is not finished, but a scientist says, "It would be
fantastic. A rat could get into space we couldn't get to and a rat would get
out if it wasn't safe." Perhaps for the first time in history, people will
be happy to see a rat in a building (but only after an earthquake, of course).