问题
单项选择题
X线计算机体层成像设备（）
A．CR
B．CT
C．DR
D．DSA
E．MRI
答案
参考答案：B
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X线计算机体层成像设备（）
A．CR
B．CT
C．DR
D．DSA
E．MRI
参考答案：B
Passage One
Concerning one’s sitting posture, which of the following is correct
A．One should prop his head with his elbows on the table.
B．One should hold an extra napkin.
C．One should be upright in his chair.
D．One should lean against the back of his chair.