[单项选择]下列对北京奥运会火炬接描述正确的是（ ）
A. 历时120天，跨国五大洲13个国家的13个城市及境内的30个省的103个城市
B. 历时130天，跨国五大洲15个国家的154个城市及境内的30个省的100个城市
C. 历时130天，跨国五大洲16个国家的154个城市及境内的31个省的106个城市
D. 历时130天，跨国五大洲19个国家的19个城市和香港、澳门以及境内的31个省区市，行程15万公里，21880名火炬手参与火炬接力

Historians and philosophers agree that ever since the development of agriculture, human beings have had art effect on the natural habitat (动植物生息地) of many plants and animal species. As human populations have increased, as many as 6,000 species are disappearing each year. A number 10,000 times greater than before man appeared on the planet. In one day alone, say scientists, some 45 kinds of plants and animals will die, some 17,500 species will be wiped out.
In 1977, the United States Congress took an important step to help the ever - increasing number of endangered species. With the enforcement of the Endangered Species Act, some species have gained more public recognition than others. Elephants and whales, for example, have received far more media attention than have the smaller, less known, and less attractive species that are also endangered. Yet it is the tiny species, such as bugs and bacteria, that keep the planet in balance. Scientist