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Brown bears, ti gers and other animals move quietly through forests. They can’t be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark-colored and they live under the soil(土壤)in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order to survive, they have to hide themselves in the daytime and appear only at night. Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over, its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all. ( ) 1.It is not easy for birds to catch locusts because____________. . A .locusts are good runners B. locusts can jump very high C. locusts are smarter than birds D. locusts can change their color ( ) 2. According to the passage, most soil insects_________ A.do not have bright colors B. change their colors with the soil C. do not live in a dark and wet environment D. Eat colorful insects like butterflies and bees ( ) 3.What’s the meaning of the underlined word “survive” in the passage? A. 繁殖 B. 产卵 C. 觅食 D. 生存 ( ) 4.The ink fish_______so that its enemies will not see it? A. changes its color B. makes the water around it black C. appears only at night D. hides itself in the sea rocks ( ) 5. What is the main ides of this passage? A. Some insects and animals have different skills. B. Some insects and animals are clever than we think. C. Some insects and animals use colors to protect themselve s. D. Some insects and animals can get used to the environment easily. B Everyone tries to get to school on time. But when bad weather gives you trouble(麻烦), can you still make it before the bell rings? In northern China during spring, big sandstorms(沙尘暴)often make trouble for students and everyone else. When the sky is dark with sand, buses and cars all move much more slowly. Sometimes, people can’t even see for 20 metres. Sandstorms usually happen in spring. This year, sandstorms started in late March. They have happened in more than 10 provinces (省) in northern China this year. More than 70 million people have had problems in those places because of the sandstorms. People in southern China don’t have to worry about this kind of bad weather. Most of the sand comes from Gansu and Inner Mongolia(内蒙古). In northern China, lots of places h ave few trees and don’t get much rain. People there have been cutting down too many trees. When there aren’t many trees, the ground can’t keep enough water. Over the years, the ground dries up and turns to sand. When spring comes and the ice melts(融化), the ground becomes looser(更松散的). Strong winds take the loose sand into the sky. (责任编辑：admin) |