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been a superstition among mariners that porpoises(海豚)will save drowned men by pushing them to the surface，or protect them from sharks by surrounding them in defensive formation．Marine Studio biologists have pointed out that，however intelligent they may be，it is probably a mistake to credit dolphins(海豚科动物)with any motive of life-saving．On the occasions when they have pushed tO shore an unconscious human being they have much more likely done it out of curiosity or for sport，as in riding the bow waves of ship．In 1928 some porpoises were photographed working like beavers(海狸)to push a shore a water logged mattress．If，as has been reported，they have protected humans from sharks，it may have been because curiosity attracted them and because the scent of a possiblemeal attracted the sharks．Porpoises and sharks are natural enemies．It is possible that upon such an occasion a battle ensued(接着发生)，with the sharks being driven away or killed． A.Porpoises have a tendency to save drowned men．B.Sharks have a tendency to attack human beings．C.Porpoises save drowned men out of curiosity．D.Sharks are often attacked by porpoises． 参考答案： C Porpoises save drowned men out of curiosity．----------------------------------------1、I’m very tired this evening，it was a long day at the office． 参考答案： I’m very tired this evening，for it was a long day at the office． I’m very tired this evening，for it was a long day at the office．----------------------------------------2、The boy got into a fight at school with a scar on his temple． 参考答案： The boy with a scar on his temple got into a fight． The boy with a scar on his temple got into a fight．----------------------------------------3、I plan on working overtime．To get this job finished． 参考答案： I plan on working
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