某孕妇,弓形虫IgM阴性,IgG阳性,说明()
A.弓形虫急性感染
B.弓形虫慢性感染
C.未感染过弓形虫
D.曾有过弓形虫感染,并已产生免疫力
E.以上都不是
参考答案:D
-How often do you exercise?
- _____. [ ]
A. For two hours
B. By bus
C. Never
D. more than half an hour
培训指导就是对员工进行技术指导吗?