单项选择题
A. impossible B. difficult C. lucky D. easy
A. Modern medicines are now available all over the world. B. Many big and modern hospitals are expensive. C. Traditional medicines are neither mysterious nor magical. D. Humans have used some kinds of medicines since earliest days.
A. can cure all kinds of diseases B. may cure some of today’s most serious diseases C. are no longer useful for modern men D. are too cheap to be useful