题目

什么是生态平衡？ 答案：在个生态系统中,如果植物、动物和微生物的数量维持在走的水平且变化不大,这种状态叫做生态平衡。阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。Train No.FromToDeparture Time(出发时间)Arrival Time（到达时间）11BeijingShenyang6:3517:50186ChengduTaiyuan22:505:05185TaiyuanChengdu13:0917:30271TianjinBeijing10:2112:21根据列车时刻表完成下列各题。（1）The train from Beijing to Shenyang leaves (离开) at ________.A.5:05B.6:35C.8:35D.17:50（2）It takes ________ from Beijing to Shenyang by train.A.17 hours and 50 minutesB.24 hours and 25 minutesC.6 hours and 35 minutesD.11 hours and 15 minutes（3）The No.186 train arrives in (到达) Taiyuan at ________.A.10:50 a.m.B.10:50 p.m.C.5:05 p.m.D.5:05 a.m.（4）It takes ________ from Tianjin to Beijing by train.A.about two hoursB.half an hourC.about three hoursD.over two hours（5）If you want to go to Chengdu from Taiyuan, you can take the ________ train.A.No. 11B.No. 185C.No. 186D.No. 271