{{B}}quEstions 9 to 12 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、{{/B}}

A．BECAusE sCiEntists likE mosquitoEs,
BECAusE mosquitoEs ADApt quiCkly AnD CAn ChAngE thEir BoDy ChEmistry.
C．BECAusE thE mEDiCinE AgAinst mosquitoEs is oF BAD quAlity.
D．BECAusE thErE ArE too mAny mosquitoEs.