Agroupofswimmershasdescribedhowagroupofdolphinsprotectedthemfromagroupofwhitesharks（食人鲨）offthecoastofNewZealand.Thelifeguardswereonatrainingswimwhentheycameacrossagroupofgreatwhitesharksbeforethedolphinsracedintohelp.

Theswimmersweresurroundedbythedolphinsforfortyminutesbeforetheywereabletomakethemsafetybacktothebeach.Itwasanuncomfortableexperienceastheywerecircledbyagroupofwhitesharkswhichcamewithinacoupleofmetersofthem.LifeguardRobHoweswasinthewaterwithacolleagueandhisteenagedaughter.Hesaidaroundhalfadozendolphinssuddenlyappearedandforcedthemtogathertogether.Themammalsswamintightcirclestocreateaprotectivewallbetweenthewhitesharksandthelifeguardsasthegreatwhitesharkswereunderthesurface.

Theswimmerssaidthedolphinswereextremelyupsetandrepeatedlyslapped(拍打)thewaterwiththeirtailsasiftotrytopreventthewhitesharksfromattackingthem.It’sadaythey’llneverforgetespeciallyforonewhowasonherfirstdayasavolunteer.Theyhavenodoubtthatthedolphinsactedonpurposetoprotectthem.Researchershavesaidthatthey’renotsurprised.Amarinebiologistinsistedthatdolphinswhichareconsideredtobeoneofthemostintelligentmammals“liketohelpthehelpless.”

1.Howmanyswimmersareattackedbythewhitesharks?

A.Two.B.Three.C.Four.D.Five.

2.Itseemedthatthedolphinsslappedthewaterwiththeirtailsto____.

A.attackthewhitesharksandthelifeguards

B.playwithwatertogetherforpleasure

C.stopthelifeguardsbeingharmedbythesharks

D.attractthewhitesharkstokillthelifeguards

3.Theunderlinedwords“avolunteer”refersto____.

A.alifeguardB.RobHowes’sworkmate

C.RobHowesD.RobHowes’sdaughter

4.Whichofthefollowingcanbethebesttitle?

A.DolphinsProtectSwimmersfromSharks

B.SharksProtectSwimmersfromDolphins

C.LifeguardsProtectDolphinsfromSharks

D.LifeguardsProtectSharksfromDolphins