单项选择题

Which of the following assumptions about early humans is expressed in the passage

A．They probably had extensive knowledge of plants.
B．They thought there was no need to cultivate crops.
C．They did not enjoy the study of botany.
D．They placed great importance on the ownership of property.

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单项选择题

What does the comment This is logical. in line 5 of the first paragraph (underlined) mean

A．There is no clear way to determine the extent of our ancestor's knowledge of plants.
B．It is not surprising that early humans had a detailed knowledge of plants.
C．It is reasonable to assume that our ancestors behaved very much like people in preindustrial societies.
D．Human knowledge of plants is well organized and very detailed.

单项选择题

According to the passage, why has general knowledge of botany begun to fade

A．People no longer value plants as a useful resource.
B．Botany is not recognized as a special branch of science.
C．Research is unable to keep up with the increasing numbers of plants.
D．Direct contact with a variety of plants has decreased.

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