单项选择题

It is simply a moral ______ not to segregate children from their peers since they learn by interacting and modeling.

A．intrusion
B．charge
C．imperative
D．request
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单项选择题
We had come here to escape a ______ summer heat wave and to examine firsthand some of the park's problems.
A．malignant
B．ferocious
C．hideous
D．absurd
单项选择题
Koon has ______ himself in a world of commercialism that most modern artists disdain.
A．engrossed
B．obsessed
C．fascinated
D．preoccupied
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