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 increasing numbers of plants.
D．Direct contact with a variety of plants has decreased.

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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.

单项选择题

In Line 15, what is the author's purpose in mentioning a rose, an apple, or an orchid

A．To make the passage more poetic.
B．To cite examples of plants that are attractive.
C．To give botanical examples that all readers will recognize.
D．To illustrate the diversity of botanical life.