单项选择题

Compound microscopes have two separate lenses or sets of lenses.

A. split
B. equal
C. detachable
D. distinct
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Early universities did not originate as institutions, but began instead as collections of scholars.
A. rather
B. at first
C. appropriately
D. accidentally
单项选择题
One of the newer conservation projects undertaken by the state of Oklahoma involves flood prevention.
A. topics
B. programs
C. concerns
D. schools
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