问题
完形填空
I live in Albuquerque and I used to give much money to the homeless around, feeling sorry for their misfortune. But later I became a single mom with no home, a huge ---36--- and hardly any income. ---37---, I stopped giving and became very bitter.
Several years later, things started to ---38---. I became ---39--- enough to have a home, and ---40--- a backyard, and I started to pull myself out of debt. One day we saw a homeless person with the ---41---, “ Will work for food. ” I ---42---. My daughter asked why I no longer helped the people in ---43---. I replied, “ Honey, they just use that money for ---44--- or other bad things. ” She didn’t respond. But when I said that, it didn’t feel right. Three days later, I was ---45--- to pick up my daughter from school. A man was standing on the corner and something deep inside ---46--- me to help him. So I stopped my car , and he ran over with enthusiasm. He said, “ God bless you, I only need 77 cents. ” I ---47--- into my ashtray and ---48--- enough, there sat three quarters and two pennies. Greatly shocked by this ---49---, I gave him all the money in the ashtray. He ---50--- with joy and tears in his eyes, “ You just made it ---51--- for me to see my mom for Christmas ! The bus offering this great sale is ---52--- right away ! ” It was a moment I’ll never forget. I think that man won’t forget it either, but I was the one who got the best ---53--- in life_____giving. It also ---54--- me that nothing is a coincidence, ---55--- everything has meaning.
答案
小题1:A 小题1:C 小题1:D 小题1:B 小题1:A 小题1:C 小题1:D 小题1:C 小题1:B 小题1:A 小题1:D 小题1:A 小题1:B 小题1:D 小题1:D 小题1:C 小题1:B 小题1:A 小题1:D 小题1:B 略
实验题
某同学想探究通过铅笔芯的电流与其两端电压的关系，设计了如图所示的电路。选用的器材有：阻值约为4Ω的2B铅笔芯一根，两节干电池组成的电池组，0～0.6A的电流表，0～3V的电压表，滑动变阻器(10Ω 2A)，开关，导线等。
(1)该同学根据电路图连接电路，在闭合开关前应将滑动变阻器的滑片P移到 ________端(选填“a”或“b")。 (2)闭合开关后，两电表的指针都发生了偏转，但无论怎样移动滑片，两电表的示数均保持不变且都在量程范围内，则产生故障的原因是____________________。 (3)排除故障后，该同学移动滑动变阻器的滑片，将获得的几组数据记录在下表中。当采集第三组数据时，电流表指针的偏转情况如图所示，此时电流表的示数为 A。
(5)请根据表格中的五组数据在给定的坐标纸上画出铅笔芯的I—U图线。 (6)由画出的图线可知，通过铅笔芯的电流与其两端电压的关系为： 。
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