[填空题]In the past eight years USAID has experimented a lot and improved various methods to slow the spread of epidemic.

[填空题]In the past eight years USAID has experimented with and improved various methods to slow the spread of HIV/AIDS.

[填空题]In the past eight years USAID has experimented a lot and improved various methods to slow the spread of epidemic.

[简答题]Over the past 50 years, technology has changed the fishing industry dramatically. Today, the romantic, rugged individual fisherman is as threatened a species as the cod and tuna that once swarmed into his nets. This is the cumulative result of more sophisticated fishing gear, more powerful boat engines and a lack of regard for local fishing environments by the multinational enterprises that have come to dominate this business. There are about 30 million professional fishermen worldwide, but 50 percent of the fish caught at sea are captured by only 1 percent of the boats, notes Xavier Pastor, European vice-president for Oceans, a non-profit international advocacy group for the world’s oceans. "Industrialized fishing is leading to the disappearance of the small fisherman," he observes, with concomitant damage to both fish stock and to local economies and social structures. "Some fleets are just too big," Pastor says. "They are very efficient at taking the last fish in an area, th

[单项选择]

In the past 200 years, Australia has lost 19 species (种类) of animals and 76 species of plants.
The Australian National Parks and Wildlife Service estimates that between 100 and 250 million species of animals and plants have lived on Earth since life began about 3.5 million years ago. Today, there are between 5 and 10 million species, of which up to 1 million or more species could be extinct (灭绝) by the year 2010.
Today the council of state and federal ministers responsible for nature conservation (保护) has produced a list of currently endangered vertebrate fauna (脊椎动物). Three species of whale, various birds, a number of frogs, snakes and fish are also on the list.
But there is some cause for optimism (乐观). Several species previously believed extinct have reappeared in recent years.
This could mean that other "extinct" species may yet surface--even the Tasmanian tiger, which some authorities believe still exists in the remote regions of Tas
A. life history on Earth
B. animals and plants in the world
C. disappearances of animals and plants in Australia
D. discoveries of new animals and plants in Australia

[单项选择]

Over the past 600 years, English has grown from a language of few speakers to become the dominant language of international communication. English as we know it today emerged around 1350, after having incorporated many elements of French that were introduced following the Norman invasion of 1066. Until the 1600s, English was, for the most part, spoken only in England and had not extended even as far as Wales, Scotland, or Ireland. However, during the course of the next two centuries, English began to spread around the globe as a result of exploration, trade (including slave trade), colonization and missionary work. Thus, small enclaves (聚居地) of English speakers became established and grew in various parts of the world. As these communities proliferated, English gradually became the primary language of international business, banking, and diplomacy.
Then came the 20th century and its burst of technology. Suddenly people were talking across oceans, flying across continents,
A. The expansion of English as an international language.
B. The number of non-native users of English.
C. The French influence on the English language.
D. The use of English for science and technology.

[单项选择]In the past twenty years, he has （）great wealth by hard work.
A. asserted
B. undertaken
C. recollected
D. accumulated

[单项选择]During the past years, intelligent technology has evolved (116) three generations. The first was characterized by tools such as prolog and OPS. prolog is a simple backward-chaining environment, and OPS is a simple forward-chaining environment. This led to the second generation of knowledge-engineering environments. Its goal was to model, prototype and construct (117) systems.A. custom B. knowledge C. through D. problem solving