6．16．Why did the Indian went to see his doctor？
A．Because he was badly ill．
B．Because he often felt tired．
C．Because the doctor was his friend．
17．What did the doctor ask him to do？
A．To take some medicine．
B．To stop smoking cigars（雪茄烟）．
C．To have a good rest．
18．When did the Indian come to see the doctor again？
A．After a year．
B．After a month．
C．A week later．
19．How did the India feel when he saw the doctor again？
A．He felt quite well．
B．He felt even worse．
C．He felt tired．
20．From the story we can guess that the Indian略．
A．smoked too much before
B．smoked a little before
C．could not smoke at all before．
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