单项选择题

Located in Washington D. C. , the Library of Congress contains an impressive （）of books on every conceivable subject.

A．flock
B．configuration
C．pile
D．array

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单项选择题
Too often Dr. Johnson's lectures （）how to protect the doctor rather than how to cure the patient.

A．look to
B．dwell on
C．permeate into
D．shrug off
单项选择题
Having a(n) （）attitude towards people with different ideas is an indication that one has been well educated.

A．analytical
B．bearable
C．elastic
D．tolerant
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