Human beings ____(31)____ to protect only the beautiful and non-threatening parts of our environment. We tend to pay more ____(32)____ to animals on land than any other large sea animals. Environmentalists have not done ____(33)____ to help save the Pacific Ocean sharks whose population has decreased nearly to the ____(34)____ of extinction. Sharks are among the oldest creatures on earth, having survived in the seas for more than 350 million years. The fact that they have managed to live in the oceans for so many millions of tears is enough proofs of their efficiency and adaptability to change environments. Its time ____(35)____ human beings to begin considering the protection of sharks as an important part of a program for protection of our natural environment.31. A. makeB. seemC. letD. advise 32. A. attentionB. pleasureC. noticeD. fun 33. A. too muchB. too manyC. much enoughD. enough much34. A. B. C. D. 35. A. B. C. D.