问题 填空题

电阻R1、R2串联在电路中已知R1:R2=3:2则通过的电流之比I1:I2     

电阻两端的电压之比U1:U2     

答案

1:1  3:2

题目分析:根据串联电路的电流特点可知两电阻串联时通过的电流关系,根据欧姆定律可知两电阻两端的电压关系。串联电路各处的电流相等,两电阻串联时通过的电流相等,即I1:I2=1:1; U=IR,它们两端的电压之比U1:U2=R1:R2=3:2。

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阅读理解

阅读理解。

     After Maggie Doyne graduated from high school, she decided to spend a year traveling the world before

starting college. The journey changed her life and the lives of hundreds of orphaned children forever.

     In 2006, Doyne took a trip in Nepal, Asia. Having grown up in New Jersey, Doyne was shocked to see

so many orphaned children living on the streets. She wanted to do something about it. Doyne used her savings

to buy an acre of land. Then, she built the kids a home, the Kopila Valley Children's Home.

     Now, the Do Something foundation is doing something for Doyne. The organization provides resources

and support for teens that want to make a difference in the world. On Thursday night, the foundation named

Doyne the $100,000 prize winner of the 2009 Do Something Award.

     The Kopila Valley Children's Home officially opened its doors in 2008. Doyne, now 22 years old, cares for

26 kids. She has helped more than 700 other orphans find families. She also runs a program that provides

scholarships for needy families to send their children to school. The children learn basic skills such as sewing

and cooking. They also grow their own food in their garden and raise farm animals.

     Doyne admits that she didn't have it all figured out when she first arrived in Nepal. "I just felt that there

was something there for me," she said. Her parents were supportive of her. But it was a challenge to convince

other adults that an 18-year-old girl could accomplish such a big project. Still, Doyne never gave up on fund

raising. In just over a year, she had enough money to build her dream home.

     "When all the kids are sitting at the table for breakfast, or they're happy and all dancing... it's the best feeling

in the world." she says.

1. After graduation from high school, Doyne determined _____.

A. to continue her education in college

B. to change the lives of orphaned children

C. to tour the world before going to college

D. to set up the Kopila Valley Children's Home

2. What do we know about the Do Something foundation?

A. It is an organization intended for orphans.

B. It is an organization set up in Nepal, Asia.

C. It officially opened its doors in 2008.

D. It offers Doyne great honor and support.

3. It can be inferred from the passage that _____.

A. Doyne overcame great difficulties in building the home

B. everything in Nepal worked out as Doyne had expected

C. with her parents' help, Doyne stopped raising funds

D. it was easy to persuade adults around to support Doyne

4. Which of the following words can best describe Maggie Doyne?

A. Brave

B. Caring

C. Talented

D. Cautious