单项选择题

(The Chinese) were the first and (large) ethnic(种族) group (to work) on the construction (of) the transcontinental railroad system.

A. The Chinese
B. large
C. to work
D. of
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(It) was (her) (who) represented her country in the United Nations and (later) became ambassador (大使) to the United States.
A. was
B. her
C. who
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(It is) (extremely) important (for) an engineer (to know) to use a computer.
A. It is
B. extremely
C. for
D. to know
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