原子核由哪些粒子组成( )
【考点】原子结构
【解析】【解答】原子核由质子和中子组成,故C正确,而A、B、D错误。
故选C。
【分析】原子由原子核和核外电子组成,核外电子带负电;而原子核由质子和中子组成,质子带正电,中子不带电,据此解答。
原子核由哪些粒子组成( )
如图所示,监测器测得同一声源发出的甲,乙两声音的特性如下表。甲乙相比( )
书面表达
初中生活即将结束,请你想一下,谁是你最喜欢的老师?他、她长什么样子?你 为什么喜欢他/她?
以My favorite Teacher为题,用英语写一篇短文,请根据要点进行描述,可以结合具体事例,也可以适当增加自己想写的内容。
要点:1. What does he/ she look like?
2. Why do you like him/her?
3. ......
注意:1.词数80-100
2.可适当增加细节及要点以外的内容,要求行文连贯;
3.文中不得出现真实姓名及学校名称。
阅读填词
根据短文内容,在每个空格处填写一个适当的词,使文章意思完整且符合逻辑。(每空一词)
weight hungry was test eat see well going carefully all |
根据对话内容,用恰当的单词、短语或句子补全对话。
A: Hello, Tom. Tomorrow is Sunday. Shall we go swimming?
B: . I am not feeling well.
A: ?
B: I have a headache. I think .
A: You are tired? Maybe you should take a rest.
B: . I'll have a good sleep this afternoon.
A: I hope you'll be better soon. And Let's go swimming next time.
B: All right. !
A: Bye
I can't follow you, Tom. Please say it (再一次).
Li Rui (弹奏) the guitar after school everyday .
He replied to my letter very (快速地).
She is so (幸运的) to take a photo with her favorite singer.
根据中文提示完成单词,使句子完整、通顺。
This activity showed us the (重要性) of protecting our environment.