人体被病原体侵袭后不出现临床症状，但可产生特异性免疫，称（）
A.病原体被消灭
B.潜伏性感染
C.隐性感染
D.显性感染
E.带菌者
参考答案：C
在一个周长是17.6厘米的正方形内，画一个最大的圆，那么这个圆的半径是______厘米．
The Chinese writer has got lots of fans in France. His new book _____ into French as soon as it came out.
A．was translated
B．translated
C．is translated
D．translates
