题目

Choosethe words or expressions and complete the passage. Do you walk to school every day? That willwork, but not if you get up late in the morning, you may be late for yourclass. If you like bad smells and crowding, the bus might be your choice. Butwhy not a bicycle? A bicycle will get you there 1 than your feet and will save your money. Thisis 2 you see more bicycles than any other kind oftransportation in China, about 500 million of them. That's close to one forevery two people in the whole country. But if you survey your class at school,you 3 will find a higher rate. Bicycles become more an3．一列火车匀速行驶，完全通过一条长450米的隧道需要25秒的时间．隧道顶上有一盏灯，垂直向下发光，灯光照在火车上的时间是10秒，则火车的速度为30米/秒．