—Which is the girl's name?
—_________. [ ]
A. Nick
B. Mark
C. Andy
C
草履虫在生态系统中属于（ ）
A．生产者
B．消费者
C．分解者
D．既是生产者又是消费者
Many of the audience ______ asleep when they ______ the lecture.[ ]
A. fell; were hearing
B. were falling; heard
C. had fallen; heard
D. fell; had heard
