单项选择题

Professor McDonald's______ knowledge on this subject resulted in his authority in this academic field.

A．extensive
B．excessive
C．expensive
D．intensive
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单项选择题
Martin Luther King Jr. campaigned for the______ of civil rights to black people.
A．expansion
B．extension
C．intention
D．contribution
单项选择题
Just as a book is often judged______ by the quality and appearance of its cover, a person is judged immediately by his appearance.
A．previously
B．uniquely
C．outwardly
D．initially
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