阅读下面两篇短文，从各小题所给的四个选项中选出能回答所提问题或完成所给句子的最佳答案。
Dolphinsarenotfish.Theyaremammals（哺乳动物）.Theyliveingroupsandspeaktoeachotherintheirownlanguage.Buttheyarequitedifferentfromalmostalllandanimals.Theirbrain（大脑）isasbigasmen’sandtheylivealonglife----atleast20or30years.
Likesomeanimalsdolphinsusesoundstohelpthemfindtheirwayaround.Theyalsousethesesoundstotalktoeachotherandtohelpthemfindfood.Theydonotusetheirearstoreceivesoundsbutusethejaw---thelowerpartofthemouth.
Itisstrangethatdolphinsarefriendlytomenandforthousandsofyearstherearemanystoriesaboutdolphinsandmen.Inthe19thcenturyinadangerouspartoftheseanearNewZealandtherewasadolphin.TheseamenlikedhimverymuchandgavehimaverygoodnameJack.From1871to1903Jackmeteveryboatintheareaandshowedittheway.In1903apassengeronaboatwiththenameofThePenguinshotandhurtJack.Luckilythedolphindidn’tdieandafteralongtimehewaswellagain.HeguidedtheshipsthroughtheareaforninemoreyearsbutherefusedtohelptheboatThePenguin.
Todaysomepeoplestillkilldolphinsbutmanycountriesintheworldnowprotectthem.Intheseplacespeoplearenotallowedtokillthem.
1.Thewordjawmeans_______inChinese.
A.下颚 B.嘴巴 C.嘴唇 D.鼻子
2.Howdodolphinsfindtheirway?
A.Theyusetheirnosestosmelltheway.
B.Theyusetheirearstohearthesounds.
C.Theyusetheireyestoseetheway.
D.Theyusesoundstofindtheway.
3.WhowasJack?
A.Thewriter. B.Adolphin.
C.Aseaman. D.Thepassenger.
4.Thedolphinguidedtheshipsforabout_______.
A.32years B.9years C.41years D.23years
5.AccordingtothepassagewhichofthefollowingisNOTright?
A.Dolphinsarenotfish.
B.Dolphinsdon’tliveingroups.
C.Dolphinsarekindandfriendlytopeople.
D.Dolphinscanlivealonglife.
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