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

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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

单项选择题

The first paragraph tells us the author ______.

A．was interested in flowers and insects in his childhood
B．lost his hearing when he was a child
C．was born to a naturalist's family
D．didn't like his brothers and sisters