Everybody hates ratsBut in the earthquake capitals of the world-Japan，Los Angeles，Turkey-

Everybody hates rats．But in the earthquake capitals of the world-Japan，Los Angeles，Turkey-rats will soon be man's new best friends．
What happens after an earthquake? We send in rescue（救援） 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 spaces．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（信号）．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．Christian Linster at Cornell University—New York says，“Robots' noses don't work well when there are other smells around．Rats are good at that．” 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 Julie Ryan of International Rescue Corps in Scotland says，“It would be fantastic．A rat could get into spaces 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）．
【小题1】In the world earthquake capitals，rats will bee man's best friends because they can     ．A．take the place of man's rescue jobsB．find the position of people alive who are trapped in buildingsC．serve as food for people alive who are trapped in buildingsD．get into small spaces【小题2】From the third paragraph we know the rescuers can judge a person is alive by    ．A．the noise made by the ratB．the rat's unusual behaviorC．the signal sent by the radio on the rat's backD．the smell given off by the person【小题3】 In doing rescue jobs，    ．A．rats smell better than dogsB．dogs don't need to be trained to smell peopleC．robots' sense of smell can be affected by other smells aroundD．rats can see in the dark and smaller than robots【小题4】 Rats have all the following advantages except that    ．A．they are more fantastic than other animalsB．they are less expensive to train than dogsC．they don't need electricityD．they are small and can get into small placesB