×40000用科学记数法表示为( ).
A:125×105
B:-125×105
C:-500×105
D:-5×106
人体的消化腺主要包括____、____、____、____、____等.
He found _______ wrong _______ him to drop litter carelessly in the park.
西安事变得以和平解决的关键是( )