单项选择题

The nucleus of the atom is composed of swiftly moving protons and neutrons that are held together by very strong forces.

A．mixed
B．propelled
C．pounded
D．bound
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单项选择题
Theories of teaching have not been as fully developed as have theories of learning.
A．thoroughly
B．liberally
C．eagerly
D．properly
单项选择题
Dotting the marshy expanse of the Florida Everglades are little islands known locally as hummocks.
A．generally
B．to all
C．in that area
D．occasionally
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