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
New England town meetings, in their most highly developed form, are assemblies of the voters.
A．protests
B．gatherings
C．responsibilities
D．liabilities
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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