看图读一读，选择相应的单词。
gift card firecracker firework
Dropping litter ______ never allowed in our city.
绘生物图时，对图中较暗部分的绘制要求是（ ）
This boy is Peter Smith. His1 name is Peter. His2 name is Smith. This is3 school. His school4number is 20048567. His teacher is Miss White. Miss White 5a good teacher. Li Min is a Chinese boy. Li Min is his good 6 at school. Look!7 a pencil sharpener. Is the pencil sharpener 8? I9know. Let's10 Li Min at 495-6548.
①k=0时，F（x）恰有一个零点．②k＜0时，F（x）恰有2个零点．
③k＞0时，F（x）恰有3个零点．④k＞0时，F（x）恰有4个零点．
