单项选择题

A．Light speed is millions of times faster than sound speed.
B．Light speed is a million times slower than sound speed.
C．Light speed is about millions of times faster than sound speed.
D．Light speed is about a million times faster than sound speed.
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单项选择题
A．Study in a quiet place.B．Improve her grades gradually.C．Change the conditions of her dorm.D．Avoid distractions while studying in her dorm.
A．Study in a quiet place.
B．Improve her grades gradually.
C．Change the conditions of her dorm.
D．Avoid distractions while studying in her dorm.
单项选择题
By saying seek reinforcement for their own destructive acts (Para.1), the author means ________ .
A．find excuses to justify their violent behaviors
B．ask others to help with their aggressive actions
C．boost their confidence so as to committee more violence
D．compete with each other in committing violence
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