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    It was a hot,humid day, and my brother Walt and I had decided that the only way to surviveit would be to go swimming in a deep swimming hole across Mr. Blickez's pasture(牧场) and through some woods.

    The onlyproblem with our plan was that this pasture was guarded by a huge, meanHereford bull. Mr. Blickez had told us that Elsie was the meanestbull in the township, maybe even the county, and we believed him. But the hotter it got, the more we thoughtthere was something fishy about his claim. For one thing, we remembered Mr. Blickez liked telling tall tales; for another, Elsie seemed like an oddname for a bull.

    Finally, Italked Mom into asking permission for us to walk through the pasture, but thenanother problem surfaced.Mom said she would talk to Mr. Blickez if we would take our cousin Joanie along with us. Joanie was almost two years older than me anda head taller. If her teasingever got around my grade school, it would be all over for me. In fact, I still had a headache from a quarrelwith her that morning.“I'm not goingswimming with that dumb girl cousin.” I told my mom.

  “Either Joaniegoes with, or you stay home alone,” Mom said in her serious tone. I gave in and we set out. On our way across the pasture, Walt yelledsuddenly. Elsie hadapproached him quietly and was licking(舔) his back. Joanie and Idove under the wire fence, but while I was on the ground I looked up and sawthat Elsie wasn't a big mean bull after all. She was going to keep licking my brother's back as long as he stoodstill.

    We had manygood days growing up and visiting our secret swimming hole guarded by theso-called “big mean bull”. And as it turned out, for a girl cousin, Joanie hasn't been too bad. She's been one of my best friends over theyears.

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同类题3

实验室内设置有四辆脚踏车,每逢下课同学们就会排队来骑脚踏车,因为骑车不仅可以健身,同时还可以发电供学校使用.装在自行车上的发电机工作时把____ 能转化成电能.同学们用如图实验装置探究发电机的工作原理,探究中有同学们提出了问题:“感应电流的大小会跟哪些因素有关呢?”

小明猜想:“可能跟磁场的方向有关.”

小华猜想:“可能跟导体切割磁感线运动的方向有关.”图是小明的实验装置,闭合开关后,铜棒ab、电流表、开关组成闭合电路.小明将实验中观察到的现象记录在表中.

次数

开关

磁场方向

导体ab的运动方向

电流表指针的偏转方向

1

断开

上N下S

向右运动

不偏转

2

闭合

上N下S

向右运动

向左偏转

3

闭合

上N下S

向左运动

向右偏转

4

闭合

上N下S

向上运动

不偏转

5

闭合

上S下N

向下运动

不偏转

6

闭合

上S下N

向右运动

向右偏转

7

闭合

上S下N

向左运动

向左偏转

(1)小明分析得出:闭合电路中的部分导体在磁场里做____ 时,导体中就会产生感应电流.

(2)比较实验次数2和3(或6和7)可知:在磁场方向一定时,感应电流的方向与____ 有关.

(3)比较实验次数2和6(或3和7)可知:____ .

(4)此实验的研究方法有控制变量法和____ 法.

(5)针对这个实验小明进行了进一步的探究,他提出了“感应电流的大小可能与切割磁感线运动的速度有关”的猜想,请你写出验证小明猜想的主要步骤:____ .