Step 1 预习检查
猜猜看下面说的是什么交通工具。
1.It travels along a fixed route and has many stops to let people get on and off. It can take you to many places but does not cost you much. （ ）
2. It is the fastest way of travelling to a place far away, but it will cost you a lot of money. （ ）
3. Thousands of people go to work on it every day. It is fast and it is under the ground.
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4. It is like a bus, but has two floors. （ ）
5. It is a car with a driver, and you have to pay the driver to take you somewhere.
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6.It has provided transport service for people living in the north-west New Territories since 2002. （ ）
