_______ are associated with the mature stage of the thunderstorm.
A.Updrafts
B.Downdrafts
C.Squall lines
D.Both A and B
正确答案是D
_______ are associated with the mature stage of the thunderstorm.
A.Updrafts
B.Downdrafts
C.Squall lines
D.Both A and B
正确答案是D