题目

某校物理兴趣小组的同学对“水果电池”进行了实验探究，设计了如下实验。①  选择最佳电极材料的探究实验：保持极板间的距离为1．5cm，极板的有效面积为4．5cm2，选用不同的金属材料作电极。下表为实验数据。②  根据以上数据，选用           金属材料做电极制成的水果电池效果好。②根据以上数据可以知道，水果电池的内阻很大，为了测定水果电池的电动势和内阻，兴趣小组的同学利用电阻箱和电流表组成电路来测定水果电池的电动完形填空。Bill, a thirteen-year-old boy, thought he had grown up to be a man. But his parents told him, “ You won’t be a real man until you begin to___________ helping others.”One morning, his parents gave him some money to __________ some milk for them. Outside a shop he saw a homeless old man who looked very__________. Bill went to him and asked, “ What’s wrong with you?”The old man answered, “ I’m hungry. I haven’t had any food for two days.”All the thought of his parents’ words, Bill said to the old man, “Let’s go to the _________.”When they got there, Bill asked the waiter to bring out bread and coffee to the old man. The old man finished the meal quickly. After the waiter __________the plate and the cup, the old man said, “Sorry for giving you too much __________. I’m fine now. I’ll ________ forget your kindness! You are a very good young man”Bill was___________ when he heard this. Just when he wanted to pay for the meal, the waiter came. Bill and the old man learned__________ that the food was free ________ it was the birthday of the boss, and they were the first customer(顾客) that day.1.A. think about B.depend on C.give up D.go on2.A.lend B.buy C.drink D. borrow3.A.afraid B.glad C.sick D.angry4.A.bank B.library C.hospital D.restaurant5.A.sent out B.got down C.gave back D. took away6.A.excuse B.advice C.trouble D.difficulty7.A.never B.always C.usually D.sometimes8.A.nervous B. pleased C.sorry D.shy9.A. in surprise B.as usual C.once again D.at first10.A.when B.until C.unless D. because