单项选择题
His inability to learn foreign languages was a(n（）to his career.
A.objection B.defect C.obstacle D.depression
单项选择题 In general , the amount that a student spends for housing should be held to one-fifth the total（）for living expenses.
单项选择题 When you go to the doctor he asks you to describe your（）so that he can make a diagnosis (诊断).
单项选择题 He ran so fast that he was out of（）
