This means that for the first time doctors may be able to tell if an infected（被感染的）person who feels well is being ill, so that they can try to do something to prevent this.
A. in case of
B. in danger of
C. in terms of
D. in charge of
网友回答
A. in case of
(答案→)B. in danger of
C. in terms of
D. in charge of
解析：考查短语辨析。in case of万一；in danger of处于危险之中；in terms of就…而言；in charge of负责 根据意思：医生可以判断一个感觉不错的被感染的人是否处在生病的危险之中。