(1.5 分)
It is implied that a depression extending from its center
A.has only one front B.has only two fronts C.has up to two fronts D.may have several fronts正确答案D
(1.5 分)
It is implied that a depression extending from its center
A.has only one front B.has only two fronts C.has up to two fronts D.may have several fronts正确答案D
