男性，40岁，咳嗽1周，X线胸片见图7-2，X线诊断为（）。
A.肺癌
B.肺结核
C.气胸
D.正常
参考答案：D
— ______ do you write to your parents?
— Once a month. [ ]
A. How long
B. How soon
C. How often
D. How far
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