题目

Accepting and understanding other cultures is something that everyone needs to learn. Think of the world as a giant pizza. Without all the different vegetables, cheeses and meats, all you get is a tasteless pizza crust (面包皮). But when you put them all together, you get something very interesting, tasty, and good. So let’s break down the walls between cultures. One way to help break down the walls between us is to understand that many of our ancestors may come from the same place. Do you know what cultures you are from? Are you part Irish or mostly German? Did your grandparents 一辆汽车以20m/s的速度匀速行驶，该车在15s内行驶的路程是_______m。