下列有关IP地址的说法中，正确的有( )。 A．多台计算机可共用_爱下问搜题

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问题多项选择题

下列有关IP地址的说法中，正确的有( )。

A．多台计算机可共用一个IP地址

B．IP地址用于标明计算机的所有位置

C．IP地址全由数字组成

D．IP地址用一个64位二进制数表示

答案

参考答案：B,C

解析：[精析] 某一台入网主机有一个IP地址。IP地址是一个32位的二进制数，由于阅读二进制数很不方便，因此通常把32位IP地址分成4组十进制数表示，组与组之间用圆点进行分隔。

完形填空

A few weeks ago, our dog, which we had kept for more than ten years, had to be put down. First, a tumor on her stomach got worse, and she was very   36 . Then, the pain in her back got so bad that sometimes she   37  lie down in the middle of a walk and couldn't take another   38 .
When I first found out, l was very sad and cried a lot. She was more like a sister to me than a   39 .But I was also angry at my stepfather,Steve,who told us the 40  a week after it happened. He   41  because he didn' t want to worry us, and he didn't want me to get depressed(抑郁的) and fail my exams. I just thought she was   42  at the animals' hospital.
I think you know all the   43  that went through my head: She was my dog！Why didn't he tell us earlier? I didn't even get to say goodbye.
People in my family have a   44  of keeping things from me to protect me, such as only telling me that my aunt had cancer   45  she had already improved health. All I could think was: Not again !
I   46  to my mum, and she said， “I know. I'm   47 , too.” I opened my mouth to shout. And then she added, “I'm so angry with Steve that he had to   48  through all this on his own.”Hearing my mum's words, I shut up my mouth. I had been so   49  on myself. I hadn't thought about   50  Steve was going through. That dog was his baby. He'd had her for longer than he'd had us—and he had to make the decision to   51  her life, and then kept in silence for an entire   52 . All my anger melted away, and all I felt was   53 .
It makes me realize that we focus so much on ourselves that we   54  the pain of others. At that moment, my mum's words were an incredible   55  that I'll never forget.

C．contributed

单项选择题

现有一瓶混有酵母菌和葡萄糖的培养液，通入不同浓度的氧气时，其产生的酒精和CO₂的相对量如图所示。问：在氧浓度为a时（）

A．酵母菌只进行无氧呼吸

B．分解的葡萄糖中约33%用于无氧呼吸

C．分解的葡萄糖中约67%用于无氧呼吸

D．酵母菌停止无氧呼吸