【文章內(nèi)容簡介】
d option . The spiders might have rafted (乘筏 ) long distances across the sea. To figure out which story was most likely true, Harrison and her colleagues looked at the spider’s genes. They looked at the genes in seven Moggridgea rainbowi spiders from Kangaroo, and five species of Moggridgea spiders from South Africa. The Australian and African spiders split off from a mon ancestor some 2 million to 16 million years ago, the genes showed. If a large swatch (塊 ) of land washes into the sea, filled with arachnids (蛛形綱動(dòng)物 ), the spiders may be able to hide themselves throughout the journey. Plus, they can “hold their breath” and survi ve on stored oxygen during periods of temporary flooding, the researchers note. 28. What is the mon belief about land animals according to the text? A. They are sensitive to natural disasters. B. They are unlikely to move across oceans. C. They can’t ma ke a long ocean voyage. D. They float across oceans accidentally. 29. What does the underlined word “them” in Paragraph 3 refer to? A. Biologists. B. Australians. C. The spiders. D. The preys. 30. How did the researchers conclude Australian and African spiders are from a mon ancestor? A. By paring their genes. B. By observing their living habits. C. By making changes to their genes. D. By studying their physical characteristics. 31. What could be the best title for the text? A. These Spiders Traveled Globally to Hide Themselves B. These Spiders Became More Adaptive When Traveling C. These Spiders Crossed an Ocean to Australia for Survival D. These Spiders Crossed an Ocean to Bee Australians D For many, music is as important to the human experience as eating and breathing. We hear music everywhere— at home, the gym, parties and stores. But what kind of music do we prefer to listen to, and when and why do our musical preferences change? The relationship between the change of seasons and musical preferences was the focus of a study led by psychologist Terry Pettijohn. He and his team based their research on a previous study that examined the relationship between popular music preferences and the Environmental Security Hypothesis (假設(shè) ). The results showed that over time, when social and financial conditions were more risky, the songs of the year that were slower, longer, more forting and serious were most popular. And during periods in which social and financial conditions were generally stable, the result is opposite. Building on these findings, Pettijohn and his team wondered if the Hypothesis could also be applied to the change of seasons. For college students, the participants in this study autumn begins at the start of the academic school year. Gone are the carefree days of summer, when school is out. When summer es’ clocks fall back, stealing an hour of daylight, which feel like losing precious time. Winter means colder temperatures, shorter days, and, in many places in the country, snow. Spring, however, is a different story. It represents a fresh starts and when clocks spring forward, we gain an extra hour of day light. As students walk into summer, they’re absorbed in the sunshine and social activity— and enjoy a break from school. But do changing seasonal conditions influence musical preferences? To answer this question, the researchers designed two studies. What did they find? Both groups of college students favored more serious music during the seasons of fall and winter, and more active and energetic music during the spring and summer seasons. And these findings, Pettijohn argues, have practical significances. 32. The purpose of the question raised in Paragraph 1 is to ________. A. present a different opinion on music B. prove where to listen to music matters C. introduce the topic on musical preferences D. stress the importance of music to humans 33. What influences a person’s choice of music types according to the previous study? A. Whether one has enough free time. B. Whether one lives in a stable situation. C. Whether one is exposed to sunlight. D. Whether one chooses to change his life. 34. What does Paragraph 3 imply? A. Spring has a special meaning to people. B. Students aren’t fond of school in any season. C. The Hypothesis disagrees with Pettijohn’s studies. D. The length of summer time is longer than winter time. 35. How does Pettijohn feel about the findings of his studies? A. It’s unexpected. B