{{B}}in this sECtion, you will hEAr sEvErAl pAssAgEs. listEn to thE pAssAgEs CArEFully AnD thEn AnswEr thE quEstions thAt Follow.{{/B}}

{{B}} quEstions 11 to 14 ArE BAsED on thE Following pAssAgE.At thE EnD oF thE pAssAgE, you will BE givEn 20 sEConDs to AnswEr thE quEstions. now, listEn to thE pAssAgE.{{/B}}

thE ultimAtE purposE oF thE rEsEArCh is to______.A．hAvE A BEttEr unDErstAnDing oF thE liFE oF mosquitoEs
B．prEvEnt humAn BEings From BEing BittEn By mosquitoEs
C．puriFy thE EnvironmEnt
D．kEEp pEoplE AlErt