根据短文内容, 判断正误。

    When we play a game with our classmates or friends, we usually need to make some rules first. I think it's very important to have rules.

There are lots of rules in my school. We must get to school on time. We have to wear the school uniform on Mondays and Thursdays. We can't run in the hallways. We can't fight. I think it's very good to have rules at school.

    We must follow traffic (交通) rules. We can go at green lights (灯) and have to stop at red lights. The traffic rules make us safe (安全的).  

When we take a car and sit next to the driver, we must wear the safety belts (安全带). Also, children must sit on the safety seats.

如图所示，大豆种子萌发时，首先突破种皮发育成幼苗的根的结构是（    ）

①26.7+147.2=

②801.6-21.9=

③20-0.85=

④15.78+2.45=

验算：

⑤33.4-9.48=

验算：

⑥13.1+120.95=

验算：

⑦100-19.2=

验算：