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问题 选择题

如图所示，已知R1=3R2，K1断开时安培表示数为I1，K1闭合时安培表示数为I2，则I1：I2为（　　）

A．1：4

B．4：1

C．4：3

D．3：4

答案

当K1断开时，电路是R2简单电路，

则I1=

U
R2
，

当K1闭合时，R1、R2并联，且R1=3R2，

I2=

U
R1
+
U
R2
=
4U
3R2
，

所以I1：I2=

U
R2
：
4U
3R2
=3：4．

故选D．

选择题

.

—I’ve never found a better job and I’m so glad.

—___________.

A．I don’t think so

B．Too bad

C．Congratulations

D．Don’t worry
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单项选择题 案例分析题

Most people have no idea of the hard work and worry that gointothe collecting of those fascinating birds and animals that they pay to see in the zoo.One of the questions that is always asked of me is 1 I became an animal collector in the first 2.The answer is that I have always been interested in animals and zoos.According to my parents, the first word I was able to say with any 3 was not the conventional “mamma” or “daddy”,4 the word “zoo”, which I would 5 over and over again with a shrill 6 until someone, ingroupsto 7 me up, would take me to the zoo.When I 8 a little older, we lived in Greece and I had a great 9 of pets, ranging from owls to seahorses, and I spent all my spare time 10 the countryside in search of fresh specimens to 11 to my collection of pets.12 on I went for a year to the City Zoo, as a student 13 , to get experience of the large animals, such as lions, bears, bison and ostriches,14 were not easy to keep at home.When I left, I 15 had enough money of my own to be able to 16 my first trip and I have been going 17 ever since then.Though a collector's job is not an easy one and is full of 18 ,it is certainly a job which will appeal 19 all those who love animals and 20.

请在14处填上正确答案（）

A.who

B.they

C.of which

D.which
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