5.如图所示电路,闭合开关S,两个灯泡都不亮,电流表指针几乎不动,而电压表指针有明显偏转,该电路的故障可能是
A.电流表坏了或未接好
B.从点a经过灯L1到点b的电路中有断路
C.灯L2的灯丝断或灯座未接通
D.电流表和灯L1、L2都坏了
4.在如图所示电路中,电源内阻为r,定值电阻R0=r,滑动变阻器R的全部阻值为2r,当滑动头P由a向b端滑动时
A.电源输出功率由小变大
B.电源内部消耗的功率由大变小
C.滑动变阻器R消耗的功率由大变小
D.电源的输出功率由大变小
3.在如图所示的电路中,A、B、C分别表示理想电流表或电压表,它们的示数以安或伏为单位,当电键S闭合后,A、B、C三块表的示数分别为1、2、3时,灯L1、L2恰好正常发光。已知灯L1、L2的额定功率之比为3:1,则可判定
A.A、B、C均为电流表
B.A、B、C均为电压表
C.B为电流表,A、C为电压表
D.B为电压表,A、C为电流表
1.如图10-1所示,电源内阻和电压表电阻都不知道,当开关S断开时,V1的示数为12V,V2的示数为6V;当S闭合后,V2的示数为15V,则
A.电源电动势E=20V
B.电源电动势E=27.5V
C.电源内阻与电压表V1电阻之比为1:6
D.电源内阻与电压表V1电阻之比为1:12
2.在闭合电路中,下列说法中正确的是
A.电流总是由高电势点流向低电势点 B.电流越大,电源功率越大
C.电源输出功率越大,电源效率越高 D.电源输出电压越高,电源效率越高
第二节 书面表达(满分30分)
近日,某青少年心理教育网站对于中学生遇到困惑时的求助对象进行了一
次调查。请你根据以下图示,用英文写一篇短文,并谈谈遇到困难时,
你对求助对象的选择及看法。
注意:1. 词数120左右;2. 短文的开头已给出,不计入总词数。
A survey was recently held on the Internet about who we teenagers will turn to
when we meet troubles in our life or study. ______________________________
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月考答案
第一节 短文改错(共10小题;每小题1分,满分10分)
文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加,删除或修改。 增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。 删除:把多余的词用斜线(﹨)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:1.每处错误及其修改均限一词
2.只允许修改10处,多者(从第11处起)不计分。
rainy day while I was walking home with one of my friend, a truck came to a
stop besides us. The driver put the window down and offered us a umbrella because
he found we were wet through. I stood there and couldn’t believe in that a complete
stranger is so thoughtful. The man insisted, so I grateful accepted the offer, thanked him
and watched the truck disappear down the road. This man might need the umbrella
himself, and he preferred to give it to everyone else. It was a lesson to us that it was
possible to give without expect anything in return.
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