单项选择题

To cool itself, a rhinoceros soaks in mud or water because its thick hide has no sweat glands.

A．skin
B．tongue
C．horn
D．trunk
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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
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
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