单项选择题

What does the man mean

A．He lent his notes to a classmate.
B．He forgot to borrow the notes.
C．He doesn’t have an exam.
D．He left his notes in class.
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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.
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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