当代中国最严重的社会问题是()
A.人口问题
B.三农问题
C.腐败问题
D.教育问题
参考答案:C
With the help of high technology, more and more substances _________ in the past years.
A.discovered
B.have discovered
C.had been discovered
D.have been discovered
血吸虫病慢性期()
A.发热、肝大和压痛
B.门静脉高压、巨脾与腹水
C.结肠炎
D.慢性腹泻,肝脾肿大
E.肺炎