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30、2006年湖北省仙桃市、潜江市、江汉油田 We sometimes call the lion the king of the jungle（丛林） because it is stronger and more dangerous than other animals. It can 41 faster than many animals and it can hunt（捕猎）the best. It is the highest animal in the 42 food chain（食物链）. In the sea, the shark is one of the animals at the 43 of the food chain. It can swim faster than 44 other sea animals, and it can use its big teeth to eat them. What is at the top of the worlds food chain? 45 are! We are not the biggest or fastest, but we are the 46 . We could not run faster than cheetahs（猎豹）, so we 47 cars and now we can move the fastest. We could not 48 better than lions, so we invented guns（枪）. Now we can hunt the best. Peoples inventions are clever, but they can be 49 , too. For example, people invented 50 , and now they make the air and rivers dirty. This can make 51 changes. Dirty rivers kill fish. 52 bears cannot eat the fish and the bears die. If we kill one part of the food chain, 53 also die. Remember that we are a part of the food chain, 54 we are in danger too! If we protect animals, we are protecting 55 ! We should and we could do something for the world! 41. A. walk B. run C. swim D. jump 42. A. land B. sea C. mountain D. desert 43. A. front B. end C. top D. beginning 44. A. someB. any C. more D. most | 
