王长喜七选五阅读.doc

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 2 Many people think of orchids(兰花) as beautiful, sweet smelling, costly flowers that grow in hot tropical forests. 1 Some of the plants are found above the Arctic Circle. Some have an unpleasant smell. Not every species is lovely. And if you want to buy an orchid, it will cost a lot less than it once did. Orchids are among the most common plant groups in the world. 2 At the same time, orchids produced in factories have become an important greenhouse crop. 3 The flowers may be tiny or large。 But most have some common characteristics. The sepals(花苞) of an orchid form the outside of the bud(花蕾) before the flower opens. There also are two regular petals(花瓣). The third petal is the lip. For reproduction, orchid flowers have male and female parts joined into one structure. The structure is called the column. The column is the most important quality that identifies the orchid family. 4 Some are “air plants” that grow on trees. Unlike parasites(寄生虫), however, they do not rob the trees of nutrition. The world has an estimated 25,000 kinds of orchids. A big blue globe near the opening of the exhibit shoes places where orchids grow. 5 For example, Costa Rica has 1500 species. The United States has 70. The far northern nation of Greenland has four. But not everybody likes orchids. Not all orchids grow from the ground. But that is not the whole story of orchids. Orchid seeds grow slowly in the open air, The number of species in an area written near its name. Orchids come in all shapes, sizes, designs, colors and color combinations. But some orchids that grow naturally are in danger of disappearing from Earth. 3 World No Tobacco Day, Special Attention Goes to Women 1 The observance is meant to bring attention to the growing use of tobacco and its deadly effects. The World Health Assembly established the event in 1987. This year, special attention is being given to the harmful effects of tobacco marketing