如图所示，电源电压10V恒定不变，R₀=50Ω，滑动变阻器R阻值变化范围0～20Ω．小灯泡L的阻值为10Ω．

面对新的学习环境，我们都会感到一些不适应，为了尽快适应新的环境，我们应该（   ）
①做好角色转化                          ②做好心理调整 
③上网打游戏，忘记孤独          ④主动调整生活节奏 

一项工程，甲队单独做4天完成，乙队单独做6天完成。两队合做（　　）天可以完成工程的 $\frac{1}{10}$  。

    It was Children's Day yesterday, we 1the park. Our teacher was 2us.

    3 many people there. Some Young Pioneers (少先队员)4 near the river.

    5 sang and danced. There were some6 on the river. There was a hill

    7. Some boys8 in the river. We sat under 9 apple tree with our teacher. We 10on Children's Day yesterday.