第31题: [单项选择]He has been asked to account _______ his absence. A. for B. on C. of D. about 参考答案:A 答案解析:account for是固定搭配,意为“解释,说出……的原因”,如:There is not any accounting for what he has done.他的行为无法解释。而of,on和a
第37题:[单选题]GS is installed on _______ . A.one side of the beginning of runway B.one side of the end of runway C.one side of the midpoint of runway D.the centerline of runway 参考答案:A