题目内容:
WhyarepeopleadvisednottotraveltoMexico?
A.Becauseitisthemostseriousareafortheoutbreakofswineflu. B.Becauseatravelbantothecountryhasbeenordered.
C.Becausemorethan100casesofswinefluhavebeenreported.
D.TheCentersforDiseaseControlandPreventionforbidsdoingso.
参考答案:
答案解析: