四边形ABCD的对角线AC与BD相交于点O,下列不能判定四边形ABCD为平行四边形的是( )
A:AD∥BC且AD=BC
B:OA=OC,OB=OD
C:AD=BC,AB=CD
D:AD∥BC,AB=CD
The nature reserve is a good place _______ wild animals ____ live ___.
For forty years Jane Goodall has been o____ (坦率的) about making the rest of the world understand and respect the life of animals.