如图所示的电路中，电源电压保持不变，R₁=10Ω，R₂=20Ω，R₃的阻值不为零，当开关S₁闭合，S₂断开时，电压表的示数为8V；当开关S₁、S₂都闭合时，电压表的示数可能值为（      ）

   要求：1). 要点齐全，并适当发挥；

         2). 行文流畅、表达准确、书写规范；

         3). 文中不能出现考生的真实姓名、校名和地名；

         4). 词数80左右。开头和结尾已给出，但不计入总词数。

Dear Tom,

    How are you? The winter holiday is coming. For this holiday, I plan to

    All the best!

Yours,

Liu Dong

从方框中选择正确选项。完成短文．并将其字母序号写在短文后面的空格内。(方框中有两个选项是多余的)

   Sometimes, life isn't as perfect as we imagine. If so, what will you do?
   Liu Wei, the famous pianist____arms in China, is a good example. He lost his arms in a____ accident when he was only 10 years old. However, he wanted to keep his dream. He learned to swim in a recovery( 康复) hospital when he was 12. Two years____, he won two gold medals in a National Swimming Championship for the disabled. After that, he began to learn how to type with his feet. He____  the world record and became the person who could type ____ with his feet. In the following years, he started learning to play the piano.
Last year, he became the ____ of China' s Got Talent Show( 中国达人秀). He always says, " There are two ways in my life. I will____ live a wonderful life or die. " We can learn____  from Liu Wei. No matter how hard the life is, keep smiling to ourselves.
   Martin Luther King has ever said, " We must accept( 接受) disappointment in our life, but we must never lose our ____ " What he said is quite true. When we____ difficulties. Please face them bravely. Where there is a will, there is a way.

下列关于细胞中无机物的相关判断，错误的是（　　）