题目

一同学用图甲电路测量电源的电动势和内阻。所用的实验器材有：待测电源（电动势约为3V，内阻约为7Ω），保护电阻R1（阻值为10Ω），滑动变阻器R（阻值范围为0~20Ω），电流表④，电压表，开关S，导线若干。他的主要实验步骤如下：①按图甲连接电路②将滑动变阻器接入电路的阻值调到最大，闭合开关③逐渐减小滑动变阻器接入电路的阻值，记下电压表的示数U和相应电流表的示数I④以U为纵坐标、I为横坐标，作U一I图象（U、Ⅰ都用国际单位）（1）C任务型阅读。(30分） He Zhuowen,14   Some of us students are still afraid to sleep alone. But my robot can help. It can read stories and sing songs for you when you go to bed. You can have a nice sleep every night with my robot.Li Zihao,14   I'd like to make a robot cleaner. Our parents are very busy with work,but they still have to do some housework when they get back home. A robot cleaner can help with the housework a lot. Then Mom and Dad can play or talk with us. Isn’t that great?Zhang Liaoxing,13    All robots should be able to protect their owners. My robot is as powerful as the famous hero Robocop. But it is much smaller. It looks like a student. We go to school together every day. But when there is an emergency (紧急情况) ，it will protect us students and fight against the bad guys (家伙) at once.WangYuwei,13   I am often lonely,so my robot will be very friendly and kind. It can know your feelings and react (反应) like your friends. I will also let the robot read,so it knows a lot and can teach us about right and wrong,just like our parents. In a word,with my robot,you won’t feel lonely any more.根据短文内容，回答下列问题。1.How many students are talking about robots in the text?                                                       2.Whose robot can read stories and sing songs at bed time?                                                      3.Where does a robot cleaner probably help with housework?                                                      4.What does Zhang Liaoxing think all robots should be able to do?                                                        5.Why does Wang Yuwei need a friendly robot?