单项选择题

Biologists have ascertained that specialized cells convert Chemical energy into mechanical energy.

A．determined
B．argued
C．pretended
D．hypothesized
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单项选择题
As nineteenth-century American cultural aspirations expanded, women stepped into a new role as interpreters of art, both by writing works on art history and by teaching art.
A．patronage
B．imagination
C．ambitions
D．opportunities
单项选择题
Nitrogen is the most plentiful gas in the atmosphere.
A．water
B．earth
C．body
D．air
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