Although Humboldt took many risks during his trip, he lived to be 90 years old. In his lifetime, he made many discoveries and shared them with the world. As a tribute (颂扬) to Humboldt, there are rivers and mountains named after him.

　　28. We can infer that Humboldt was probably a (n)_______.

　　A. explorer

　　B. inventor

　　C. doctor

　　D. writer

　　29. Humboldt and his friend made maps of_______.

　　A. the central part of South America

　　B. the northern part of South America

　　C. the north part of Central America

　　D. the southern part of Central America

　　30. What do we know about mountain sickness?

　　A. It can be treated with a plant.

　　B. It is a serious illness like malaria.

　　C. It mainly influences one’s breathing.

　　D. It was discovered by Humboldt’s friend.

　　31. We can tell from the text that Humboldt was_______.

　　A. easy-going

　　B. imaginative

　　C. optimistic

　　D. ambitious

　　D

　　The Arctic will soon be free from ice, experts say. The change is bound to take place, but the global warming and climate change are changing the earth’s landscape (地形) rapidly，causing panic worldwide.

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