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

How were the Negroes treated in the history books

A．They were ignored.
B．They were condemned.
C．They were belittled.
D．They were praised.

单项选择题

We can infer from the first two paragraphs that the industrialists disregard environmental protection chiefly because _______.

A．they are unaware of the consequences of what they are doing
B．they are reluctant to sacrifice their own economic interests
C．time has not yet come for them to put due emphasis on it
D．it is difficult for them to take effective measures