通过化学学习，同学们对组成万物的基本物质有了进一步了解．
世界最高的高原（ ）
In many places in China, the old over 90 ____ (take good care of) not only by their family but also by the government.
如图所示，把两个小灯泡串联后接到电源上，闭合开关，发现灯泡L1比L2亮一些，对这一现象分析错误的是（ ）
