某权威部门的一份学业质量分析报告表明，新型、良好的师生关系能有效促进教育教学质量的提高。这一师生关系强调师生之间应该是（    ）

①互相教育、互相感染、教学相长       ②竞争、合作、服从

③民主、平等、和谐                               ④互相尊重、信任、理解、合作

42÷28=____

一束光垂直射到平面镜上，然后将平面镜转动θ角，入射光线保持不变，那么反射光线的方向将改变（  ）

从方框中选择适当的单词, 并用其适当形式完成下面的短文。

    Many students in the US always ____ the bus to school every day. Parents think taking the school bus is very ____. But sometimes it is also dangerous(危险的). Some students were injured (受伤的) ____they didn't follow the school bus rules. What are the school bus ____?

____ at the bus station early.

Wait ____ the bus at the bus station.

____ play around the bus station.

Don't run here and there at the bus station.

Don't walk ____ fight on the bus when it is going.

Don't get off the bus if it doesn't stop.

____ rules are good for students. Follow ____, and you can keep yourself safe.