One Good Reason to Let Smallpox Live It’s now a fair bet that we will never see the total extinction of the smallpox virus. The idea was to cap the gl...
Public and Private Schools in the United States Religious and private schools receive little or no support from public taxes in the United States, and...
Diet, Alcohol Linked to Nearly One Third of Cancers Diet is second only to tobacco as a leading____1____of cancer and, along with alcohol, is responsi...
China to help Europe Develop GPS Rival China is to contribute to a new global satellite navigation system being developed by European nations. The Gal...
Captain Cook Arrow Legend It was a great legend while it lasted, but DNA testing has___(1)ended a two-century-old story of the Hawaiian arrow carved f...
阅读下面的短文。短文中有十五个空白，在文章的后面，每一个空白都列了四个备选答案。请根据文章的内容选择合适的词或短语填在空白处。A health ProfileA health profile is a portrait of all of the factors that influence you...
Leukemia Leukemia is the most common type of cancer kids get, but it is still very rare. Leukemia involves the blood and blood-forming organs, such as...
What Makes Me the Weight I Am? There’s no easy answer to this question. Your genetic makeup, the physical traits that get passed down to you from your...
Sleeping Giant Right now, an eruption is brewing in Yellowstone National Park. Sometime during the next two hours, the most famous geyser. Old Faithfu...
Ants as a Barometer of Ecological Change At picnics, ants are pests. But they have their uses. In industries such as mining, farming and forestry, the...