【正文】 etle has bee established, possibly helped by some that arrived with imported plants on ships. Experts say over 450 kinds of lady beetles are found in North America. Some are native to the area. Others have been brought from other places. Almost all are helpful to farmers. The Asian lady beetles now in the United States probably came from Japan. The Asian lady beetle eats aphids that damage crops like soybeans, fruits and berries. In the southern United States, Asian lady beetles have reduced the need for farmers to use pestkilling poisons on pecan trees. This popular tree nut suffers from aphids and other pests that the lady beetles eat. But some people say the Asian lady beetle has itself bee a pest. They worry that the lady beetles may eat their lateautumn fruit crops. Experts say Asian lady beetles may appear in large numbers in some years. But they say the insects are too helpful to be considered as pests.21. What do ladybugs look like? A. All kinds of ladybugs are of the same color. B. They each have the same number of spots on them. C. Most of them are red, orange or black. D. Most of them have fourteen spots.22. Asian ladybugs have been in the United States for_________. A. a century B. half a century C. hundreds of years D. nine decades23. According to the experts, ladybugs are__________. A. are more destructive than helpful B. helpful as well as destructive C. more pests than helpful insects D. more helpful than considered as pests B Not many women have won the Nobel Peace Prize. Until 2004, no African women ever had. That was when Dr. Wangari Maathai won it —for planting trees. You might ask, what do trees have to do with peace? “Many wars are fought over resources(資源),” Dr. Maathai asid as she accepted the prize. “If we conserve resources better, the fighting will stop.” Dr. Maathai was born in Kenya in 1940. Unlike most African women, she went to school. High school woke up a hunger in her for more knowledge. She went to college in Kansas and earned a master’s degree in science from the University of Pittsburgh. She became the first Kenya woman ever earn a . Later, Dr. Maathai taught animal science at Kenya’s University of Nariobi. As an educated woman, Dr. Maathai feels responsible for leading others. She started her work in 1977 by planting nine trees in her backyard in Kenya. Trees are important in Africa for several reasons. First, they keep soil from eroding(流失) into streams, thus cutting down on pollution and improving the soil. Second, trees provide firewood. So many trees have been cut down in Africa that women must walk far from home to find wood for cooking. New trees can also keep deserts from spreading. Dr. Maathai’s Green Belt Movement pays local women for every tree they plant that is still alive three months later. In its first 15 years, the Green Belt Movement employed at least 50,000 women and planted more than 10 million trees. Following Dr. Maathai’s example, the Kenyan government increased its own treeplanting efforts. The movement has spread to 30 countries in Africa. When the land and people’s lives have improved, Dr. Maathai says, peace will follow.24. The following statements about Dr. Maathai are tre EXCEP_________. A. She was born in Kenya in 1940. B. She graduated from the University of Pittsburgh. C. She is a farmer by planting trees. D. She started her work in 1977 by planting nine trees.25. Dr. Maathai is the first African woman to _________. A. win the Nobel Peace Prize B. encourage people to plant trees C. get a master’s degree in science D. realize the power of knowledge26. What ‘s paragraph 4 mainly about? A. The importance of trees. B. How trees prevent pollution. C. How planting trees works in Africa. D. The history of treeplanting in Africa.27. The Green Belt Movement _____________. A. aims to provide job opportunities for women B. attracted the world’s attention to Africa C. pays for every