根据句意及汉语提示填空

1. —What's this?

    —It's an ______ (橘子).

2. Jane and Jim are my good ______ (朋友).

3. —Are ______ (这些)cars?

    —Yes, they are.

4. They are five ______ (蛋糕).

5. —What's that in ______ (英语)?

    —It's a ruler.

客户服务标准属于物流信息系统的战略规划层次。