When you travel in HongKong , you must be careful of the traffic rules , because the traffic keeps to the left and it’s d ifferent from that of the interior (内地) of China . Before crossing the street , you must look to the right and then to the left. If the traffic lights are red , the traffic must stop, people can cross the zebra line . If the traffic lights turn green , the traffic can go , people must not cross the road . In the morning and in the evening , when people go to or come from work , the streets are very busy . The traffic is the most dangerous . When you go somewhere by bus in Hong Kong , you have to be careful , too. Do remember the traffic keeps to the left . Have a look first , or you may go the wrong way . In Hong Kong, there are a lot of big buses with two floors. You’d better sit on the second floor . From there you can enjoy the city. How wonderful it is! 根据短文内容 , 选择正确答案 :