D
Sharks are fish. There are about 350 species of sharks. The smallest sharks are only 12. 5 cm long. The largest, the whale shark, is the world’s largest fish. It grows to about 1Sm long.
Sharks are different from other fish. For example, other fish have skeletons made of hard bones. Sharks have skeletons made of cartilage. In addition, most fish have a special organ called a swim bladder to stop them from sinking but sharks do not. If a shark does not swim constantly, it sinks. Shark babies grow inside eggs. The baby sharks are called pups.
Most sharks eat fish. Some also eat seals and other sharks. Many people are afraid of sharks be cause of their reputation as’ man-eaters’. However, there are fewer than one hundred shark attacks on humans in the world each year.
Humans are the sharks’ worst enemies. Fishermen kill them because of their valuable dorsal fins. Often, they catch a shark, cut off its fin and throw it
A. humans' friends
B. man's enemies
C. the world's largest fish
D. not the same as other fish
Man finds living together with his own species(物种) difficult enough and living together with other species almost impossible. Our usual solution is to kill off anything that get in our way. Even on those rare occasions when we do enter into a relationship with another species, it is heavily biased(带有倾向)in our favor. The other species benefits only when it suits our own interests. Our attempts to communicate with another species are concerned mainly with giving orders in our own language and having them obeyed. Probably our best attempt has been the whistle language that is used in the shepherd-sheepdog relationship. This is a system that is natural to neither species, but one that both can understand. Its only fault lies in fact that the bias is still there-- the dog cannot whistle for the man.
But now comes news of a piece of research that promises, for the first time, to open up two-way communication between man and another species.
At the University of
A. in the future the chimpanzee can learn language like human beings
B. in the past researchers taught a chimpanzee words of our natural language
C. man and animals can get along well if they can communicate with each other
D. the chimpanzee can communicate well with us human beings
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