单项选择题

Lighting levels are carefully controlled to fall within an acceptable level for optimal reading convenience.

A．ideal
B．required
C．optional
D．standard
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单项选择题
Factors leading to the crisis included poor regulation, mismanagement and deception in the industry, and competition from other types of financial firms.
A．cheating
B．pollution
C．depression
D．abuse
单项选择题
Sometimes the messages are conveyed through deliberate 'conscious gestures', other times, our bodies talk without our even knowing it.
A．definite
B．intentional
C．interactive
D．delicate
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