【单选题】

listEning 9 "EnginEEringClAss"
{$mEDiAurl}
whAt is this lECturE mAinly ABout
A、rEinForCED ConCrEtE in BuilDings
B、thE strEssEs CAusED By EArthquAkEs
C、EArthquAkE-rEsistAnt struCturEs
D、unDErstAnDing ConstruCtion sitEs

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根据网考网移动考试中心的统计，该试题：
5%的考友选择了A选项
4%的考友选择了B选项
72%的考友选择了C选项
19%的考友选择了D选项

listEning 9 "EnginEEringClAss"{$mEDiAurl} whAt is this lECturE mAinly ABout A、rEinForCED ConCrEtE in BuilDings B、thE strEssEs CAusED By EArthquAkEs C、EArthquAkE-rEsistAnt struCturEs D、unDErstAnDing ConstruCtion sitEs