Experiments show that changes in day length （）the migrations of many species of birds．
A.正确答案Daccumulate
B.calculate
C.formulate
D.stimulate
Experiments show that changes in day length （）the migrations of many species of birds．
Experiments show that changes in day length （）the migrations of many species of birds．
A.正确答案Daccumulate
B.calculate
C.formulate
D.stimulate
