人群中血型为O，A，B，AB型的概率分别为0．46，0．40，0．11，0．03．现任选5人，则至多有1人血型为O型的概率为()．
A. 0．045
B. 0．196
C. 0．201
D. 0．241
E. 0．461
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源自特定市场内部的创新，即通过采取市场细分与定位策略，调整现有的产品和服务，以扩大市场，这是_______。
A. 水平营销
B. 纵向营销
C. 整合营销
D. 国际营销
This passage is mainly about______.
A. the streets and the city transportation in ancient Rome
B. the living conditions of ordinary people in ancient Rome
C. the beautiful building in ancient Rome
D. the food and daily supplies in ancient Rome
【B20】
A. them
B. theirs
C. their
D. they
If you feel faint, it is best to______.
A. run about
B. lie flat
C. move slowly
D. stand up
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