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What does the author mean to say when he talks about the damage caused by earthquakes to the buildings？
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听力原文： The rattlesnake, often considered the deadliest of all North American snakes, has often been the subject of research and discussion among naturalists. This snake earns its name from the presence of rings of tough skin on its tail that remain when sloughing, or the dropping off of skin occurs. Whenever a rattlesnake is agitated, it begins to move its tail, a motion that causes the rings of hardened skin to make a rattling noise.
Most naturalists believe that this noise is an involuntary reaction that results from the nervousness of the reptile; they do not think that the rattlesnake is attempting to convey a warning to its possible victim. Studies have revealed that the rattlesnake is the only venomous snake that gives a signal before striking and, in fact, this reptile is the only species that has rattles. However, both the bull snake and the fox snake also vibrate their tails rapidly whenever they become nervous. Whether or not the rattlesnake should be called “the gentleman among snakes” because of the noise it makes before striking is an interesting question.
Which of the following statements about the rattlesnake is untrue？
What other species of snake moves its tail rapidly when it becomes agitated？
What eventually happens to the skin of the rattlesnake？
Traveling can be fun and easy. A vacation trip to another country is especially 【21】______ when the traveling conditions are good. Good traveling conditions 【22】______ a comfortable mode (方式) of transportation, knowledge of the 【23】______ language, familiarity 【24】______ the customs and habits of the people in the country, and pleasant traveling 【25】______ . All of us have iad nice trips 【26】______ this.
Most of us have also had trips! that we would 【27】______ to forget. Many conditions can pro duce a bad! 【28】______ experience. For example, if the four conditions 【29】______ above do not exist, we will probably have a bad experience, 【30】______ at best a difficult 【31】______ . Students who travel to a 【32】______ country to study often have a difficult trip. They usually travel 【33】______ They don't know the language of the new country 【34】______ . They often arrive in the new country 【35】______ a judge international airport. From the airport, they need to 【36】______ their way to their school. Maybe they need to 【37】______ airplanes, to! take a bus, a train, or a taxi. They need to do all this in a country 【38】______ everything is unfamiliar. Later, after the experiences are 【39】______ , they can laugh. But at the 【40】______ , they feel terrible.
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