--- Lots of trees and flowers ________ in Zhangzhou every year.
--- You're right. That makes our city more and more beautiful.
A:are planted
B:were planted
C:will be planted
已知:白磷的着火点为40℃
既是消化液,又没有消化功能的是( )
已知x﹣y=﹣3,xy=2,则(x+3)(y﹣3)的值是( )
四位同学针对食物链“绿色植物→食草昆虫→食虫鸟”发表了他们的见解,你认为不正确的是( )