单项选择题

Classification is a useful ______ to the organization of knowledge in any field.

A. means
B. approach
C. mode
D. manner
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单项选择题
Basically a robot is a machine which moves, manipulates, joins or processes ______ in the same way as human hand or arm.
A. characters
B. components
C. catalogues
D. collections
单项选择题
If you want children to work hard you must ______ their interests instead of their sense of duty.
A. appeal to
B. look into
C. give rise to
D. go in for
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