一般情况下，下列物体：①橡皮擦②铅笔芯③塑料尺④钢尺⑤盐水⑥食用油，其中属于导体的是____ ，属于绝缘体的是____ 。（只填序号）

近现代以来先进的中国人为救亡图存、富民强国进行了不懈的探索。

【思想指引】

材料一：

【实践探索】

材料二：魏源的改革思想为洋务运动奠定了思想理论基础；严复对当时中国国内鼓吹变法图强和提倡维新变法起过积极的作用；“***是孙中山先生革命事业最坚定的支持者、最忠诚的合作者、最忠实的继承者。”

Tell me and I'll forget. Show me and I       not remember. Let me try and I'll understand.

1916年，山西商人乔殿森集资 1.5万两白银在太谷县东关创办了利川蛋厂。该厂系诸人合资而成，对厂中员工按商家惯例，根据其表现、业绩给予顶身股，年终按股分红。试办数年后，产品正式行销出口，效益颇丰。利川蛋厂“效益颇丰”的主要原因是(　　)

    You may be surprised to learn how many animals actually have a memory. 1 your goldfish can show evidence (证据) of learning ability. If you have a pet fish, try this 2. Every day when you feed the fish, sprinkle (撒) the food only in the same location.

    Keep a record of daily observations (观察) of the fish, taking down notes about the fish's swimming directions or behavior whenever you come to feed it. Before long, the fish should swim to the spot where you sprinkle the food whenever you approach (靠近) the tank. See how it reacts (反应) to your approaching the tank and take notes before, 3, and after your experiment.

In this example of animals' memory, we don't really know if your fish knows the fact that you are going to feed it. But it has showed its 4 ability to learn and to remember.

    Bees 5 with each other in a way which shows an intelligent memory. When a bee finds a good location for gathering nectar (花蜜), it will remember 6 to get to this location from its hive (蜂巢). The bee then returns to the hive and passes along its memory by doing a complex dance to inform the others of where the food was found. It uses wings, legs, antennae (触角) and body to deliver the message. When the dance is over, other bees fly to this location to bring back food for the hive.