长江被称为“黄金水道”,这是因为它( )
图的四种现象中,属于光的反射现象的是( )
放在柜子里的樟脑丸慢慢地缩小以至消失,这一现象属于( )
A. are B. pandas C. fat D. this E. tiger
Ann and Sam are in the zoo.
Ann:What's ____?
Sam:It's a ____. It's big.
Ann:What ____ they?
Sam:They're ____. They're ____.