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.
填空题
A．AsB．SinceC．WhileD．In spite of
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