【C10】
A. outset
B. output
C. outlet
D. outcome
【C13】
A. ratio
B. proportion
C. rate
D. percentage
A.To let in the sunshine.B.To serve as its door.C.To keep the nest cool.D.For the bird
A. To let in the sunshine.
B. To serve as its door.
C. To keep the nest cool.
D. For the bird to lay eggs.
【C9】
A. scope
B. duration
C. span
D. stretch