单项选择题

A．The problem of lacking a mirror.
B．The problem of lacking a decoration for the lift.
C．A psychological problem.
D．A material problem.
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单项选择题
A．Using computers is a waste of resource.B．Many people don’’t turn off the computers after using them.C．Computers are run by electricity.D．A computer is not a must for working.
A．Using computers is a waste of resource.
B．Many people don’’t turn off the computers after using them.
C．Computers are run by electricity.
D．A computer is not a must for working.
单项选择题
What kind of view is made possible by contiguous cross sections of the body
A．Two-dimensional.
B．Three-dimensional.
C．Animated.
D．Intensified.
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