山东省成人本科英语模拟试卷43
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How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there\’s evidence they may follow their noses. Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. Scientists have supposed that the animals navigate by monitoring smell clues or the Earth\’s magnetic field, but no one knew for sure.
In new experiments near San Diego, scientists ferried wild leopard sharks about 6 miles (10 kilometers) away from their preferred habitats, fitted them with tracking devices, and stuffed some of the animals\’ noses with cotton balls. \\
1.This passage is mainly about________.(D)
A. why sharks have a good sense of smell
B. why sharks are clever animals
C. how scientists do the experiment
D. how sharks find their way in the vast ocean
解析：根据文中第一段前三句“How sharks navigate the vast and seemingly featureless ocean has long been a mystery. Now there’s evidence they may follow their noses. Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. ”可知，这篇文章主要讲的是鲨鱼如何在浩瀚的海洋中找到自己的路，故选D。
2.Which is true about the experiments done by the scientists according to the passage?(A)
A. Scientists plugged sharks’ noses to test whether they navigate through their sense of smell
B. Scientists chose sharks’ preferred habitats in order to track the animals easily
C. After being taken to deeper waters, sharks with plugged noses couldn’t make it to the shore
D. The sharks in the experiments aren’t willing to eat due to the plugged noses
解析：根据文中第四段第二句“Even the sharks with plugged noses made it partway back to shore before their tracking devices fell off. ”可知，科学家们做实验时发现，即使鼻子被堵住，鲨鱼依然可以找到路线。所以科学家们堵住鲨鱼的鼻子，测试它们是否能通过嗅觉导航，故选A。
3.We can infer from the passage that________.(B)
A. there are various markers for sharks to find their way and eyes play an important role in it
B. some scientists hold different opinions from the findings of the new study
C. the new study has completely solved the mystery of sharks’ easy navigation in the vast ocean
D. the sharks likely sniffed out chemical molecules found in higher doses nearer to land
解析：根据文中第五段第一句“Other scientists, however, remain unconvinced. ”可知，一些科学家对这项新研究的发现持有不同的观点，故选B。
4.What’s the purpose of writing this passage?(D)
A. To call on people to protect the sharks
B. To present different theories on the mystery of the sharks
C. To let people learn more about the sharks
D. To inform the readers of the findings of a new study on shark
解析：根据文中第一段第三句“Sharks rely on their sense of smell to help chart a path through the ever-shifting waters of the deep seas, according to a new study. ”可知，文章主要想要告知读者关于鲨鱼的一项新的研究发现，故选D。
Levi Strauss did not invent jeans, but he is considered the first person to make and sell great numbers of them. He was born in Bavaria, an area that today is part of Germany. In 1847 he and his family immigrated to the United States. Levi Strauss opened a small dry goods store, first in New York, then in San Francisco, California. Among the products he sold were jeans. These pants were especially useful for miners in California. They needed clothing made from a
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