单项选择题

According to the passage, the price system is related primarily to ______.

A．products and services
B．transportation and insurance
C．labour and education
D．utilities and repairs
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单项选择题
The author can’t remember his relatives clearly because ______.
A．he didn't live very long with them
B．he was fully occupied with observing nature
C．the family was extremely large
D．he was too young when he lived with them
单项选择题
The author says that he is a naturalist rather than a scientist probably because he thinks he ______.
A．has a great deal of trouble doing mental arithmetic
B．comes up with solutions in a most natural way
C．lacks some of the qualities required of a scientist
D．just reads about other people’s observations and discoveries
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