单项选择题

In the eighteenth century the heading of “natural philosophy” encompassed all of the sciences.

A．category
B．teachings
C．ideology
D．leaders
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单项选择题
Leaves are not distributed accidentally on a plant stem, but are arranged in a very precise way that assures them the maximum light.
A．dangerously
B．densely
C．randomly
D．linearly
单项选择题
The members of Aaron Burr’s family were noted for their passionate and headstrong temperament.
A．intellectual
B．stubborn
C．witty
D．steadfast
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