单项选择题

A．Excellent quality.
B．Large productivity.
C．Good flavor.
D．Both A and B.
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单项选择题
Thomas Hartung is an Italian.
A．Y
B．N
C．NG
单项选择题
Conventional X-rays mainly show the difference between _________.
A．bone and air
B．liver and pancreas
C．muscle and other body
D．heart and lungs
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