Humidity (湿度) is so intense in some parts of the tropics that Europeans find they are unable to ____ it.

The______ plants from the tropics are especially beautiful. The civilians buy them one after another. A: esthetic B: exile C: ethnic D: exotic

If there were no trees ______. A: the land would became fertile B: heavy rains would clean the tropics C: the rich top soil couldn't be held D: there would be no agriculture

This passage supports the belief that ______. A: exact reasons for migration are not known B: glaciers caused birds to migrate C: the ancestral home of birds was the tropics D: birds migrate because of changes in temperature

How did men manage to survive the "black cloud" in the tropics A: They hid in caves and cellars. B: They tried to reduce the temperature. C: They killed 7943 species of plants and animals. D: They ate ice so that the body temperature was reduced.

The author mentions some exotic plants in Reading E, which implies _________. A: these plants are foreign plants that can't grow in Cornwall but for the "Humid Tropics Biome" B: the author has never seen these plants before C: thanks to the Eden Project these plants have adapted themselves to the local climate D: exotic plants are tropical plants