【多选题】按照参考点的不同位置,GNSS定位可分为()。
【单选题】When I was reading ,my mother .
A.
was reading ; was falling asleep
C.
was reading ; fell asleep
D.
read ; was falling asleep
【单选题】When I was a child, I enjoyed()picturebooks.
【简答题】成体中干细胞的存在,主要功能是为维持机体的正常功能,形成新的 ,从而使组织和器官保持正常的生长和衰退的动态平衡。
【单选题】I()a book when the telephone().
C.
was reading…was ringing
【多选题】含唾液淀粉酶的唾液经透析后,水解淀粉的能力显著降低,其原因是 ( )
【单选题】I'll be upset ________ someone talks to me ________ I'm reading. [ ]