阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出最佳选项。
A young man was going to join the army
(军队) and had to (41) a medical examination. The doctor was
sitting at a desk when he came in. He said to the man, "Take your coat and shirt
off and (42) on that chair. The young man
did so. The doctor looked at him for a moment without (43)
up from his chair and then said, "All right. Put your clothes on again.
"But you haven’t examined me at ail!" the young man said in
(44) . "There is no need to do so," the
doctor said with a (45) . "When I
(46) you to take your coat and shirt off, you heard me all
right, so there is nothing wrong with your (47) . You saw the
chair, so your eyes are (48) . You could take your clothes
off and sit on the chair, so you must be in good health. And you understand what
I told you to do and did it without a (49) , so you
(50) healthy enough for the
army."