孕妇巨细胞病毒感染不能通过哪条途径感染胎儿（）
A.宫内通过胎盘感染
B.产道感染
C.呼吸道
D.出生后密切接触
E.哺乳
参考答案：C
I often see Tom on the playground. When I passed the playground yesterday, I saw him . [ ]
A. play; playing
B. to play; play
C. playing; to play
D. playing; play
润滑油压低的处理方法是什么？
