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.
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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
What does the comment This is logical (Line 5) mean
A．There is no clear way to determine the extent of our ancestors' 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 pre-industrial societies.
D．Human knowledge of plants is well organized and very detailed.
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