A) If you stopped at a yellow light in Calgary, you would have to shout to warn the animals not to cross.
B) In New Brunswick, traffic lights strictly apply to all vehicles.
C) A flashing red traffic light in Montreal would mean to go straight among the crowd.
D) Traffic signals do not mean same across different parts of Canada.
2. As understood from the passage, distinctive characteristics among the East Coast, Central Canada and the West include
A) Linguistic variety
B) Traditional way of clothing.
C) Pedestrians
D) Traffic police
3. According to the passage, any alert Canadian could
A) drive a space vessel.
B) give direction to an alien space vessel at an intersection in Canada.
C) drive all kinds of vehicles but tractors at intersections.
D) adapt himself or herself to the traffic system anywhere in Canada easily.
There are two main types of concrete dams: arch dams and gravity dams. Arch dams are tall, curved shells of concrete that can be as little as 3 meters thick. Their arched shape gives them great strength. Large gravity dams are also made of concrete, but it is their vast weight that prevents them from bursting. The largest dams are embankment dams, which are made by piling up a huge barrier of earth and rock. A core of clay or concrete in the middle keeps water from seeping though the dam. The side is covered with stones to protect it from water. Rogunsky Dam in the Soviet Union is the world's highest dam. It. is 326 meters high. Hoover Dam, one of the world's highest concrete dams, measures 223 meters in height. It is an arch dam that spans the Colorado River and supplies water for irrigation and electricity to California, Arizona and Nevada.
4. It can be understood from the passage that gravity dams differ from the arch dams in that gravity dams are
A) thicker than arch dams
B) not as sturdy as arch dams
C) not as attractive as arch dams
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