26()

单项选择题57（）

A. Thank you for coming along
B. I’m ready
C. I was looking for a part-time job
D. When will I know
E. It is a great job
F. That about covers it
G. How long do I have to wait
H. I have

单项选择题In paragraph 2, the author explains how having too many germs in your mouth can end up weakening the heart. Using the passage as a guide, it can be understood that doctors are ()

A. reluctant to hypothesize
B. confident in their estimations
C. extremely knowledgeable
D. uncertain but speculative