[简答题]An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat. (Passage 2)

[简答题]An elephant uses its long, pointed tusks as tools for digging in the ground for food. He also uses them as weapons in combat. (Passage 2)

[简答题]An elephant uses its long，pointed tusks as tools for digging in the ground for food．He also uses them as weapons in combat．(passage2)

[单项选择]

Country Y uses its scarce foreign-exchange reserves to buy scrap iron for recycling into steel. Although the steel thus produced earns more foreign exchange than it costs, that policy is foolish. Country Y’s own territory has vast deposits of iron ore, which can be mined with minimal expenditure of foreign exchange.
Which of the following, if true, provides the strongest support for Country Y’s policy of buying scrap iron abroad（）

A. The price of scrap iron international markets rose significantly in 1987
B. Country Y’s foreign-exchange reserves dropped significantly in 1987
C. There is virtually no difference in quality between steel produced from scrap iron and that produced from iron ore
D. Scrap iron is now used in the production of roughly half the steel used in the world today, and experts predict that scrap iron will be used even more extensively in the future
E. Furnaces that process scrap iron can be built and operated in Country Y with substantially less foreign exchange than can furnaces that process iron ore

[单项选择]

Long long ago mankind began to use tools. Throughout the world, you can still find the tools which were used over two million years ago. People made such tools by hitting one stone (36) another. By this means, they got pieces from one of the stones. These pieces of stone were always (37) on one side. People utilized them to (38) skin and meat from some animals that were dead, (39) to make other tools from wood. Mankind needed (40) use tools since, unlike other meat-eating (41) , say lions, they did not have sharp teeth. Tools greatly helped people obtain food more (42) .
Tools helped (43) human intelligence as well when human worked with them. The human brain became bigger gradually, and human beings began to invent a growing number of tools. The stone piece was one of the (44) tools that were used by people, and maybe it was (45) . Some scientists hold it was the key (46) huma
A. within
B. among
C. into
D. against

[单项选择]The United States has long imported its food and fuel, its cars and clothes. Now the faltering economy has sparked a push for another type of import: shoppers.
For the first time, lawmakers, businesses and even White House officials are courting consumers from cash-rich countries such as China, India and Brazil to fill the nation’s shopping malls and pick up the slack for penny-pinching Americans. They are wooing travelers with enticements such as coupons, beauty pageants and promises of visa reform. The payoff, they say, could be significant: 1.3 million new jobs and an $ 859 billion shot in the arm for the economy over the next decade.
"They’re their own little stimulus program, " said David French, senior vice president for government relations at the National Retail Federation, a trade group. The trend underscores the depth of the United States’ reliance on countries once considered to be at the bottom of the glob al totem pole. The nation already counts on China and othe
A. American buyers can’t afford goods because of depressed home price.
B. American buyers prefer goods of foreign countries.
C. Many Americans are facing a serious problem of unemployment.
D. American buyers made great contribution to American economy in the past.