31. The extinction of large prehistoric animals is noted to suggest that

　　[A] large animal were vulnerable to the changing environment

　　[B] small species survived as large animals disappeared

　　[C] large sea animals may face the same threat today.

　　[D] Slow-growing fish outlive fast-growing ones

　　32. Who can infer form Dr Myers and Dr. Worm’s paper that

　　[A] the stock of large predators in some old fisheries has reduced by 90%

　　[B] there are only half as many fisheries are there were 15 years ago

　　[C] the catch sizes in new fisheries are only 20% of the original amount

　　[D] the number of larger predators dropped faster in new fisherish than in the old

　　33. By saying these figures are conservative (line in ,paragragf-3), Dr worm means that

　　[A] fishing technology has improved rapidly

　　[B] then catch-sizes are actually smaller then recorded

　　[C] the marine bio mass has suffered a greater loss

　　[D] the date collected so far are pit pf date.

　　34. Dr Myers and other researchers hold that

　　[A] people should look for a baseline that can’t work for a longer time

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