Finally, not all sharks are predatory animals ready to strike at humans without warning. In fact, only 12 of the 350 species of shark have been known to attack humans, and a shark needs to be provoked in order to attack. The types of shark that have the worst record with humans are the tiger shark, the bull shark, and the great white shark. However, for most species of shark, even some of the largest types, there are no known instances of attacks on humans.
Questions 29 to 31 are based on the passage you have just heard.
29.Which of the following is true about sharks?
30.What is a misconception about the teeth of sharks?
31.Which of the following is NOT true concerning sharks attacks on humans?
Passage Three
The United States is well known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. Although these wide modern roads are generally smooth and well maintained, with few sharp curves and straight sections, a direct route is not always the most enjoyable one. Large highways often pass by scenic areas and interesting small towns. Furthermore, these highways generally connect large urban centers, which means that they become crowded with heavy traffic during rush hours, when the fast, direct route becomes a very slow route.
However, there is almost always another route to take if you are not in a hurry. Not far from the relatively new superhighways, there are often older, less heavily traveled roads which go through the countryside. Some of these are good two lane roads; others are uneven roads curving through the country. These secondary routes may go up steep slopes, along high cliffs, or down frightening hillside to towns lying in deep valleys. These less direct routes, though longer and slower, generally go to places where the air is clean and scenery is beautiful. In addition the driver may have a chance to get a fresh, clean view of the world.
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