Unless otherwise posted, the maximum (最大限度的) speed limit in Canada is 50km/hr in cities and 80km/hr on highways. On rural highways, the posted speed limit may be 100km/hr. It is illegal to take automobile radar detectors (汽车雷达检测器) into Quebec, Ontario, Manitoba, and the Yukon. Seat belt use is required by law for all passengers, and child car seats must be used by children under 40 pounds. Some provinces require drivers to keep their vehicles' headlights on during the day and some have banned (禁止) driving while using a hand-held cell phone. Motorcycles cannot share a lane (车道), and safety helmets for motorcycle riders and passengers are necessary. Running a red light is a serious crime throughout Canada and drivers are advised to stop before starting when a light turns green.

　　Winter travel can be dangerous due to heavy snowfalls and icy conditions. Some roads and bridges are often closed in winter. Snow tires are required in some provinces. Travelers should also be careful about animals while driving at night in rural areas.

　　Highway 401, from Detroit to Montreal, is one of the busiest highways in North America. It has been the scene of many deadly traffic accidents due to sudden and severe weather changes, high rates of speed, and heavy truck traffic. Thus drivers should be alert while travelling here.

　　Please refer to our Road Safety page for more information. Also, we suggest that you visit the website of Canada's national authority responsible for road safety.

　　21. Which of the following is TRUE according to the text?

　　A. All signs on the roads in Quebec are in English.

　　B. Automobile radar detectors are allowed to be used in Manitoba.

　　C. Passengers may choose not to wear seat belts while in a car in Canada.

　　D. The speed of cars in Canadian cities should be less than 50km/hr.

　　22. The underlined word "alert" in Paragraph 4 could best be replaced by _____.

　　A. careful B. relaxed

　　C. nervous D. pleased

　　23. What is the best title for the text?

　　A. Different traffic rules in Canada

　　B. Tips for traveling by car in Canada

　　C. Special rules for driving in Canada

　　D. Traffic safety and road conditions in Canada

　　"How far is the next village？" the American asks a man standing by the edge of the road. In some countries, because the man realizes that the traveler is tired and eager to reach his destination (目的地), he will politely say "Just down the road." He thinks this is more encouraging, gentler, and therefore the wanted answer. So the American drives through the night, getting more and more angry, feeling "being tricked". He thinks the man on purpose lied to him, for obviously he must have known the distance quite well.

　　Had conditions been reversed (颠倒过来), the American would have felt he was "cheating" the driver if he had said the next town was not too far, and if he would be sorry to the weary driver, he would say, "You have a good way to go yet, it is at least fifteen miles." The driver might be disappointed, but he would know what to expect.

　　Whether to be accurate or polite leads to many misunderstandings between people of different cultures. If you know the situation in advance, it is sometimes easier to recognize the problem.

　　24. The man at the roadside tells the American it is not far from the next village because he ________.

　　A. wants to encourage him to go further

　　B. doesn't know the exact distance at all

　　C. wants to help the man to decide whether to stop and have a rest

　　D. tries to play a trick on him

25. We can learn from this passage that Americans ________.