2022八年级下册第40期答案英语周报

第二节One possible versionFinally, as his sob quieted, his mother pulled back to look athim. " Rex, take the bird to Mr. Blake and tell him what happened.You will never have peace if you dont face him. Mr. Blakedeserves to know the truth she said with a firm look. The walk toMr. Blake's house was difficult. Leaving his mother in the yardRex stepped to the front door with the dead turkey. He knockedhoping Mr Blake wouldnt answer. But the door openedHi, Mr: blake, Rex handed him the dead bird. When he toldthe whole story of how he killed the turkey by mistake, Rex lookedat the ground, too frightened to look up there was a momentssilence and then Mr. Blake said, Thats all right. We'll eat it fordinner today. A smile appeared on his face. Rex couldnt believewhat he had heard. As he ran home he felt as if a rock had beenlifted from his shoulders. He realized that doing the right thing wastruly easy in the end

21.BC根据右手定则可知,①情形导体框中的感应电流方向为顺时针方向,若要使两次产生的感应电流方向相同,根据楞次定律,则②中磁感应强度大小必须逐渐减小,A错误;根据切割感应电动势公式E=BLυ及闭合电路欧姆定律可得①情形下感应电流大小为l1②情形下感应电流大小为l2=,欲使l1=l2,解得2Bu,B正确;①情形下,导体框离开磁场的过程中,外力对导体框所做的功为W=F·L匀速时F=F安,又F安=Bl1L,由以上整理得W=D2,C正确心①情形下,在导体框离开磁场的过程中,通过导体框某一横截面的电荷量为q=t,又t=L,整理得q=BLD错误

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