2022英语周报八年级fim答案

Li Hua第三节One possible versionParagraph 1Run!" Eddie yelled. Cathie was running as fast asshe could down the road. Eddie soon caught up with her.Then he suddenly remembered Marie. They stopped andturned. Marie was nearly paralyzed with fear as she stum-bled down the road towards them, waving her arms wildlyhough frightened, Cathie and Eddie had to go backLuckily, the noises were fading away as Cathie and Eddieack. Each one grabbed an arm and practically draggedMarie down the road. When there was no sign of pursuitthey slowed down, each convinced that they had met BigfoParagraph 2When they reached their driveway they sme Mr. Kingtcho came to delier corn was talking to Dad. The kids triedto slip into the house unnoticed, but Dad motioned for themto come over and asked whether they were walking up bythe dam. They looked at each other and allheads. "My prize pig broke out of the barn two days agoand I stillfind it, Mr. King said in a worriedvoice. Hearing that, Dad laughed."Maybe you should gosee Fred MeAfree. Something tells me he saw your pigThen he glanced towards the kids as though he knew whathad happene

3.(1)C(2分)E(2分)(2)如图所示(2分)(3)左(2分)(4)灯丝电阻(率)随温度升高而增大(2分)(5)0.58(0.56~0.60,3分)【解析】(1)由P=U【得小灯泡的额定电流为0.5A则电流表选C;为方便实验操作滑动变阻器应选E(2)小灯泡正常发光时电阻R=10.5=4a,RAa6-6.2-190-252.2>人,则电流表采用外接法,描绘小灯泡两端的U-I图象,电压与电流从零开始变化,则滑动变阻器应采用分压接法。(3)为保证实验安全,在闭合开关前应使小灯泡两端电压为零,因此滑动变阻器的滑片应置于最左端。(4)因小灯泡电阻随温度的升高而增大,故图象上的点与坐标原点连线的斜率应越来越大,所以图象发生了弯曲。(5)可把电源等效为电动势为4V内阻为100的电源,设每个小灯泡两端电压为U,则电流与每个小灯泡两端电压的关系式为2U=E-Ir,即2U=4-10I,在图中作出小灯泡两端电压与电流的关系图线,如图所示,交点的纵坐标即为小灯泡的实际工作电压,为0.58V。2.0l.61.20.80400.10.20.3040.5

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