下列各数,属于科学记数法表示的是______
A:53.7×102
B:0.537×102
C:537×102
D:5.37×103
-- It is reported that many wild animals in the world are _______ because of human behavior.
-- We must do something to stop people from hunting and selling these animals.
选出恰当的应答语。
A.Thanks!
B.No,it isn't.
C.It's a toy car.
D.OK!
E.It's under the book. (1) ____ (2) ____ (3) ____ (4) ____ (5) ____
接下来李伟通过如图所示实验操作验证他的猜想: