题目内容:
WhyistheaveragecostofchildcareinMississippimuchlowerthaninMassachusetts?
A.Theoverallqualityofserviceisnotasgood. B.Paymentsforcaregiverstherearenotashigh.
C.Livingexpensestherearecomparativelylow.
D.Eachteacherisallowedtocareformorekids.
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答案解析: