单项选择题
It is not easy to remain
tranquil
when events suddenly change you life.
A．calm
B．upset
C．steady
D．severe
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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
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