She is ____ the couch. [ ]
A. in
B. on
C. at
答案：B
When asked what original intention would lead them to volunteer, about _______ said they were “willing to do something for the Games.”
A．half of them
B．half of which
C．half of whom
D．half of who
赤霉素不具有（）的生理作用。
A、促进细胞分裂
B、促进植物开花
C、打破休眠，促进发芽
D、防止脱落，促进果实生长
