单项选择题

As the old empires were broken up and new states were formed, new official tongues began to ______ at an increasing rate.

A．bring up
B．build up
C．spring up
D．strike up
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单项选择题
It s very ______ of you not to talk aloud while the baby is asleep.
A．concerned
B．careful
C．considerable
D．considerate
单项选择题
Some plants are very ______ to light; they prefer the shade.
A．sensible
B．flexible
C．objective
D．sensitive
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