单项选择题

According to the passage, ________.

A．four types of the blood were discovered by Japan
B．people of good blood might do their work very well
C．knowing your own blood group you could get a good idea
D．more and more countries accepted the new idea about blood group

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单项选择题

Creative persons, good salesmen, thinkers and problem solves are the four kinds of persons needed in the Japanese company. The proportion (比例)mentioned in the passage is______ respectively.

A．30%, 15%, 25%, 30%
B．30%, 30%, 25%, 15%
C．30%, 25%, 30%, 15%
D．25% , 15%, 30%, 30%

单项选择题

The main idea of the passage is ________.

A．even Americans are surprised at the big differences among themselves
B．there are many differences in character in different parts of the USA
C．there are many reasons for the differences
D．stereotypes about people are not necessarily true