第24题: [单项选择]某施工队计划用120个劳动力在规定时间内完成一定的挖土任务,施工25天后,因调走30人,于是每人每天必须多挖1方土才能在规定时间内完成任务。问:在25天后每人每天挖土多少方( ) A. 3 B. 4. C. 5 D. 6 参考答案:B 答案解析:设25天后每人每天挖土J方,又规定时间为t天(参数),于是有120(x-1)(t-25)=(120-30)x(t-25)。解得x=4。故选B。
第27题: [单项选择]Why is the English teacher angry with the man A. Because the man didn’t finish his homework last week. B. Because the woman didn’t finish her homework last week. C. Because neither of the two speakers finished their homework last week. 参考答案:A 答案解析:[听力原文] F:I didn’t finish my homework last week. M:I didn’t, either. And the English teacher is