单项选择题

According to the passage, what was the first great step toward the practice of agriculture

A．The invention of agricultural implements and machinery.
B．The development of a system of names for plants.
C．The discovery of grasses that could be harvested and replanted.
D．The changing diets of early humans.

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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

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 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.