— Can Jane and Jill swim?
— No, they .
A:can
B:can't
C:am not
D:don't
如图,平行四边形ABCD中,AE⊥BC,CF⊥AD,垂足分别是E、F.求证:△ABE≌△CDF.
使成都平原变成“水旱从人,不知饥馑”的天府之国,得益于秦朝蜀郡太守李冰主持修筑的都江堰。( )