单项选择题

People are surprised to learn that _______.

A．Negroes' achievements are not shown in history books
B．Phillis Wheatley learned English
C．Negroes are good at mathematics
D．Negroes have a very long history in America

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单项选择题

The main task now facing ecologists, environmental activists and conservationists is _______.

A．to prevent pollution by legislation, economic incentives and persuasion
B．to arouse public awareness of the importance of environmental protection
C．to take radical measures to control environmental pollution
D．to improve the quality of life by enforcing environmental standards

单项选择题

The word tunnel-versioned (Line 2, Par

A．4) most probably means _______.A. narrow-mindedB. blind to the factsC. short-sightedD. able to see only one aspect