用方框中所给单词的适当形式填空，使短文正确、通顺。每词限用一次。world,kill,but,danger,bad,with,land,become,clever,swimWesometimessaythelionis“thekingoftheforest”becauseitisstrongerand

　　用方框中所给单词的适当形式填空，使短文正确、通顺。每词限用一次。

　　world,kill,but,danger,bad,with,land,become,clever,swim

　　Wesometimessaythelionis“thekingoftheforest”becauseitisstrongerandmoredangerousthanotheranimals.Itisatthetopofthefoodchainon____.Inthesea,thesharkisatthetopofthefoodchain.Itcan____fasterthanmostotherseaanimals.Itcanalsocatchotherseaanimalsandeatthem.

　　Whatisatthetopofthe____foodchain?Human!Wearenotthebiggestorfastest,butwearethe____.Weinventedcarssothatwecanmovethefastest.Weinventedguns(枪)tohunttheanimals.Weareveryclevertoinventthings,____wecanbedangerous,too.Forexample,manyyearsagoinInnerMongolia,peopleusedgunsto____alotofwildwolveswhichusuallyeatwildrabbits.Butinrecentyears,withthedecreasing(减少)ofthenumberofwildwolves,thenumberofwildrabbitsis____biggerandbigger.Andthewildrabbitsbegintocompete(竞争)forthegrass____thesheepandcows.Asaresult,muchofthegrasslandbecomesdesertbecauseitis____destroyedbytherabbits.

　　Rememberthatweareapartofthefoodchain,sowearein____,too!Ifweprotectanimals,weprotectourselves.