5.What does the man think that the woman has been downtown to do?
A.Buy a pair of shoes. B.Buy a dress for herself. C.Buy him a dress.
4.What is the man going to do in the afternoon?
A.Get some sleep. B.Visit the Great Wall. C.See a doctor.
Conversation 3
3.What can we know about the woman?
A.She’s a Chinese living in Beijing.
B.She’s a foreign visitor who has just arrived in Beijing.
C.She’s a foreigner who has been staying in Beijing.
2.What advice does the man give to the woman?
A.Talking more with foreign speakers.
B.Practicing listening and finding a person to write to.
C.Watching some English programs on TV
Conversation 2
1.What does the woman think is hardest in English?
A.Listening B.Speaking C.Writing
23.(1)BD(2分)(2)①A(2分)、C(2分)、F(2分)
②如图所示(4分,电路图有一处接错者不得分)
23.(1)1.998(或1.997;1.999)(2分)1.094(2分)
(2)①如图a(2分)
②如图b(2分)
③
(2分).式中U为电压表的示数,I为电流表的示数,R1为电阻箱的示数.
(1分)
④电阻箱的阻值调到最大;或使滑动变阻器所分的电压为零;等。(1分)
2010德州一模:
![]()
23.(12分)
(1)①平行(1分) 远小于(1分)
②
∝x或
(2分)
(2)①a实验电路如图所示(3分)
b29.5W~30.4W(2分)
②当电压低于250V时,压敏电阻上流过的电流几乎是零,即电阻可看作无限大,压敏电阻对电路几乎无影响,变压器正常工作。(1分)
当电源电压突然升高,高于250V时,流过该电阻电流会迅速增大,电阻几乎为零,使得a、b两点短路,这时保险丝立即熔断,电源被切断,保护了变压器的安全。(2分)
2010济宁一模:
11.(1)(4分)AB
(2)(9分)①2.000mm(2分) ②5Ω (2分),连线如图(1分)
③(4分)
![]()
(评分标准:正确选出并在图中画出电流表A1及电压表V1的各得1分,A1采用外接的得1分,滑线变阻器采用分压式接法的得1分。)
2010聊城一模:
23.(1)①
(或
)(2分)
②验证机械能守恒(或外力做功与物体动能
变f{:的关系)(2分)
(2)①(3分)
![]()
②a.增大(2分) b.增大(2分)
2010临沂一模:
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