甲型肝炎的人群感染率为()
A.80%
B.50%
C.70%
D.60%
E.30%
参考答案:A
So far there _____ great changes in my hometown. [ ]
A. are
B. are going to be
C. have been
D. will be
社会主义只能通过市场机制发挥配置资源。