单项选择题

What is the main idea of the passage

A． Global growth is less lopsided than for many years
B． a comparison of economies of the three engines of the global airplane.
C． America's impact on the world's economy
D． The three economy's contribution to the world economy

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单项选择题

What is the best title of the passage

A． Big corporations: pioneer of environmentalism
B． Consumer demand and development of green tag
C． Green tag and its extra cost.
D． Transformation from car devotee to environmentalist

单项选择题

What is the function of the last paragraph

A． a summary of the whole passage
B． a repetition of the views expressed
C． a challenge to the views expressed
D． an intensification of the theme of the essay