单项选择题

Such euphemisms may be stylistically "permissible" if they are kept within _______.

A．boundaries
B．ranges
C．borders
D．limits
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单项选择题
It was difficult to _______ a date which was convenient for everyone.
A．decide
B．arrange
C．organize
D．provide
单项选择题
Xenon has a number of applications, _______ may be mentioned its use in flash lamps for high-speed photography.
A．Among which
B．which
C．and which
D．each of which
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