单项选择题
A．They are not as dangerous as people think. B．They can be as friendly to humans as dogs. C．They attack human beings by nature. D．They are really tame sea animals.
A．Make sure there is no misunderstanding. B．Try to persuade by giving various reasons. C．Repeat the same reasons. D．Listen carefully and patiently to the other party.
A．When it is breeding. B．When it feels threatened by humans in its territory. C．When its offspring is threatened. D．When it is suffering from illness.