Some people are afraid of starting a casual(随意的) conversation with a stranger because of a fear of not having anything interesting to say. Fear of refused is also a1for keeping silent. Small talk in a conversation can 2 as a way of warming up and getting to3each other. Most people, no matter 4 successful they are at work, will find the process of 5 small talk uncomfortable, even meaningless.6 , you will have a pretty small world 7 you refuse to let others in. Starting off with a casual comment or question will make others 8, and even just greeting them with a simple “hello” will often be enough.

    Once you have made the first 9 , there is no turning back. You need to keep things 10  before you can politely say goodbye. Think about what you would like to 11 with a new friend and that is what you can ask the other person about. Work, family, hobbies or interests are some12_points of discussion. To keep the ball rolling, you can show that you are really 13in what they are saying. Once you find common 14 of interest, things will certainly15 off from there.

    Small talk can16out to be a pleasant experience. The conversation 17 be brief and casual without turning into a long and boring discussion. Do not let yourself 18 the conversation. Stop worrying about how big of a fool you may appear to be. You may19 find out later on that you have the “20” of getting people to open up to you by engaging them in small talk.

按要求，写单词。

watch（现在分词）____

如图为训练蚯蚓走“T”字形迷宫的实验．进行实验时，在迷宫的一臂安上电极，另一臂是潮湿的暗室，暗室里有食物．请分析回答下列问题．

（1）在实验过程中，当蚯蚓爬到安有电极的一臂，就会受到____ ．经过一段时间的训练后，蚯蚓能够学会选择，爬向有____ 的一臂．

（2）从这种行为产生的主要因素来看，它属于____ 行为．

（3）产生这种行为的原因是：电极对蚯蚓的生存有____ ，故蚯蚓____ ；而潮湿、有食物的暗室，对蚯蚓生存有____ ，故蚯蚓会趋向____ 的一边．