【单选题】Although scientists have______long the human appendix as______organ, there is a growing body of evidence indicating that the appendix does in fact have a significant function as a part of the body's immune system.
A．overestimated … a minor
B．discounted … a vestigial
C．valued … a major
D．ignored … a pivotal
E．(E) studied … an inaccessible
发布评论 查看全部评论