看汉字，写拼音。

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 龟                   捕                 肚

阅读下列材料，回答问题：

材料一：

材料二：2008年9月由美国华尔街引发的金融危机如海啸般在全球蔓延，几乎没有几个国家能够幸免。这场经济危机对全球的深远影响已经显现了。全球的经济格局、政治格局和外交格局正在因此而“重新洗牌”，当今世界格局的发展趋势已经在诸多领域的全面蔓延和深化。

【1.】I'm Mary. I have a friend. Her name's Sally. She's clever and helpful. We are both eleven. Our birthdays are both in May. We're in the same class. We like each other. We're good friends.

【2.】We both live far from school. We live in different streets. We both go to school by bus. We both have lunch at school. We both like fish. She often shares (分享）her lunch with me.

【3.】We both like playing games. We often play games together at the weekend. She is good at playing games.

【4.】We both like dolls. Because they are soft and nice. But we like different colours. I like pink and Sally like white. I have a pink doll and she has a white doll.

Dear Kelly,

    Today is Friday. It's evening in Shanghai. I'm writing to tell you something about my life (生活).My mother is cooking. My father is watching sports news(新闻).My brother, Tim, is playing computer games. My little sister, Mary, is drawing. My dog Dick is taking my hat to me. He wants me to put it on and go out for a walk with him. He's a clever dog and he is often excited(兴奋的)to see me.

    Outside, I can hear cars and buses coming and going. Also there are some boys playing ball games. It's a noisy(吵闹的)but happy evening. Do you think so?

    What are your family doing now?

    Please write me soon.

Yours,

Daniel

根据材料内容选择最佳答案。

加在导体两端的电压为6V时，测得导体电阻为20Ω．如果加在导体两端的电压为12V或0V时，导体的电阻为（）