问题 单项选择题

在一个非零无符号二进制整数之后添加一个0,则此数的值为原数的( )。

A.4倍

B.2倍

C.1/2

D.1/4

答案

参考答案:B

解析: 非零无符号二进制整数之后添加1个0,相当于向左移动了1位,也就是扩大到了原来数的2倍。在一个非零无符号二进制整数之后去掉1个0,相当于向右移动了1位,也就是变为原数的1/2。

读图填空题
写作题

读写任务。

阅读下面的短文,然后按照要求写一篇150词左右的英语短文。

     When I was growing up, I had an old neighbor named Dr. Gibbs. He didn't look like any doctor I'd ever

known. When Dr. Gibbs wasn't saving lives, he was planting trees.

     The good doctor had some interesting theories concerning planting trees. He believed in "No pains, no

gains". He never watered his new trees, which was beyond many people. Once I asked why. He answered

that watering plants spoiled them, and that if you water them, each following tree generation will grow weaker

and weaker. So you have to make things tough for them. He talked about how watering trees made for shallow

roots, and how trees that weren't watered had to grow deep roots in search of water. I took him to mean that

deep roots were to be treasured.

     So he never watered his trees. He'd plant an oak (橡树) and, instead of watering it every morning, he'd

beat it with a rolled-up newspaper. Smack! Slap! Pow! I asked him why he did that, and he said it was to

get the tree's attention.

     Dr. Gibbs passed away a couple of years after I left home. Every now and again, I walked by his house

and looked at the trees that I'd watched him plant some twenty-five years ago. They're extremely tall, big

and strong now. Those trees wake up in the morning and beat their chests and drink their coffee black.

【写作内容】

     (1) 以约30词概括短文内容要点;

     (2) 以约120词就“个人成长需要艰难生活的磨砺”这一话题发表你的看法,并包含以下要点:

          ① 你是否赞同Dr. Gibbs的做法,为什么?

          ② 叙述当前父母溺爱子女的现象和由此造成的后果;

          ③ 假如你是父母一方,你会如何磨砺自己的孩子?

【写作要求】

     (1) 可以使用实例或其他论述方法支持你的论点,也可以参照阅读材料的内容,但不得直接引用原

           文中的句子;

     (2) 文中不能出现真实姓名和学校名称。

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