43. A. front　　　　　　　　　 　 　　 B. end　　　　　　　　　 　 　　 C. top　　　　　　 　　 D. beginning

42. A. land　　　　　　　　　 　 　　 B. sea　　　　　　　　　　 　 　　 C. mountain　　　　　 D. desert

41. A. walk　　　　　　　　　 　 　　 B. run　　　　　　　　　 　 　　 C. swim　　　　 　 　 D. jump

55．A．angrily　　 B．sadly　　 C．softly D．shyly

6

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 world’s 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.

　　　 People’s 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!

54．A．address　　 B．name　　 C．number D．job

53．A．die　　 B．work　　 C．study D．1eave

52．A．me　　 B．you　　 C．US D．her

51．A．when　　 B．as soon as　　 C．since D．even if

50．A．heard　 。　　 B．remembered　　 C．forgotten D．said

49．A．where to go　 B．how to speak　　 c．what to say D．which to choose