During the 19th century, it was common to hear people in Europe and America say that the resources of the sea were unlimited. For example, a noted biologist writing in the mid-19th century commented that none of the great sea fisheries(渔业) are to be exhausted. Today though, there is evidence that the resources land and the air,  and that the endangered species (种类) include Herring and Carp as well as the African Elephant, Indian Tiger, and the American Eagle. Further, the threats to fish are more alarming in some ways than the threats to animals and birds. This is because fish are a much needed food resource and people throughout the world depend on fish as an important part of their dish,  and the decline (下降) in the fish supply could have extensive effects on hunger and population. Fishermen in the North Atlantic alone annually harvest 20 billion pounds of fish to satisfy food demands, but it is important to recognize that these practices cannot continue without depleting (耗尽) fish storage within the next few years. Sea resources are rapidly declining in many parts of the world, and the problem cannot he ignored (忽视) . We can predict that food supplies in the sea can not last forever. 1. According to the speaker, what was the attitude(态度) in the 19th century toward resources of the sea? A. Declined. B. Depleted. C. Limited. D. Unlimited. 2. What is the range(地带)  of the decline in fish supply? A. Europe and Asia. B. The whole world. C. Asia and America. D. America. 3. What does the author believe about sea resources？ A. Sea resources can last forever. B. None of the great sea fisheries are to be exhausted. C. Fish supply has no effects on people. D. Sea resources are important to people. 4. Which of the following best describes the purpose of the lecture? A. Unlimited Sea Resources B. Threats to Animals and Birds C. Sea Resources on the Decline D. Protection of Fish