大兴安岭﹣太行山﹣巫山﹣雪峰山一线是我国（  ）

    Singapore's public transport system(公共交通系统)is one of the best in the world, so you should have no problem finding your way around like a local. There are three main forms of public transport that you would find in any other major city--trains, buses and taxis.

TRAINS

    Trains run from 6: 00 am to midnight. Single trip tickets start at 80 cents. If you buy an EZ-link card for MYMI5, you can ride the trains and buses all you like.

    If you need more information, just call Transit Link on 1800 767 4333.

BUSES

    There are several bus services in Singapore and fares start at 80cents. Be sure to always ask the driver the cost of your ticket as he cannot give changes.

    If you need help, just call Transit Link on 1800 767 4333.

TAXIS

    There are three main taxi companies--city Cab(6552 2222), Comfort(6552 1111) and Tibs (6552 8888). Booking can also be made easily by calling the numbers listed above.

RENTAL CARS

    Driving in Singapore is a pleasure and if you like to travel at your own pace, renting a car is a good choice. Renting takes away the hassle of getting to places around Singapore. Just sit back and enjoy the city. It also means you'll get to see a lot more that a train or a bus won't let you see.

    For car rental, call Avis on +656737 1668

八年级学生小叶不认真学习，经常旷课、逃学。老师批评他，他却说：“受教育是我的权利，我想上学就上学，不想上学就不上学，别人管不着。”小叶的言行（   ）
①没有珍惜受教育的权利                    ②没有履行受教育的义务
③认为权利和义务具有一致性            ④割裂了权利和义务的关系 

一只空瓶的质量为300g，装满水后总质量为800g，而装满另外一种液体时总质量为700g
求：(1)瓶子的容积；
(2)另一种液体的密度。