[单项选择]The United States and Canada have agreed ______ in regard to the Great Lakes.


A. to eliminate swimming entirely
B. to limit boating and
C. to limit phosphates and detergents
D. to kill all algae

[单项选择]The United States and Canada have agreed ______ in regard to the Great Lakes.


A. to eliminate swimming entirely
B. to limit boating and
C. to limit phosphates and detergents
D. to kill all algae

[单项选择]Once upon a time, the United States seemed to have plenty of land to go around, "go around" means ______.
A. to visit around
B. to see the land
C. for sharing with every
D. to have the land around

[单项选择]Why do lakes in the United States and Canada become dead lakes


A. Fish in the lakes die because acid rain deprives them of oxygen.
B. Fish in the lakes die from taking in poisonous substances released from the acids.
C. Fish in the lakes die from direct contact with accumulated acid in the water.
D. Air pollutants are dissolved in the water and thus kill the fish.

[单项选择]

Many United States companies have, unfortunately, made the search for legal protection from import competition into a major line of work. Since 1980 the United States International Trade Commission (ITC. has received about 280 complaints alleging damage from imports that benefit from subsides by foreign governments. Another 340 charge that foreign companies "dumped" their products in the United States at "less than fair value". Even when no unfair practices are all alleged, the simple claim that an industry has been injured by imports is sufficient grounds to seek relief.
Contrary to the general impression, this quest for import relief has hurt more companies than it has helped. As corporations begin to function globally, they develop an intricate Web of marketing, production, and research relationships. The complexity of these relationships makes it unlikely that a system of import relief laws will meet the strategic needs of all the units under the s
A. They will eliminate the practice of "dumping" products in the United States.
B. They will enable manufacturers in the United States to compete more profitably outside the United Stats.
C. They will affect United States trade with Canada more negatively than trade with other nations.
D. Those that help one unit within a parent company will not necessarily help other units in the company.

[单项选择]The United States and Canada are lands of ______ except for the Indians, who are the only true natives.
A. emigrants
B. dwellers
C. inhabitants
D. immigrants

[单项选择]What is now the United States might have been divided into several countries ______ the South ______ the Civil War.
A. had, won
B. if, won
C. should, win
D. were, to win

[单项选择]In the United States, amendments must have the approval of _______of the states before they enter into force.
A. one-third
B. two-thirds
C. two-fifths
D. three-fourths

[单项选择]

Shopping habits in the United States have changed greatly in the last quarter of the twentieth century. (1) in the 1990s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was. (2) on both sides with many. (3) businesses, Here shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, and groceries (4) some shops offere (5) These shops included drag-stores, shoe-repair stores and barber or hairdressing shops. (6) in the 1950s, a change began to (7) Too many automobiles had crowded into Main Street (8) too few parking places were (9) shoppers. Because the streets were crowded, merchants began to look with inter6st at the open spaces (10) the city limits. Open space is what their car-driving customers needed. And open space is what they got. (11) the first shopping center was built. Shopping center (12)
A. on
B. in turn
C. by turns
D. further