3.下列化合物中,不能由单质直接化合得到的是
A.NO B.Na
2.下列说法中,正确的是
A.化学科学与其他科学分支的联系不密切
B.化学研究的主要目的就是认识分子
C.化学家可以制造出自然界中不存在的物质
D.化学研究会造成严重的环境污染,最终人类将毁灭在化学物质中
1.物质的用途和该物质的性质密切相关。下列关于物质性质与用途的叙述错误的是
A.钨丝能承受高温,受热能够发光,可制造灯丝
B.钛制品非常轻,却非常坚固,不易变形,可用于制造人造卫星和太空飞船的部件
C.硅的导电性介于导体和绝缘体之间,可制造晶体管和集成电路
D.铅无毒,抗蚀能力又高,可制造罐头筒
注意:1. 词数:100左右; 2. 可适当增加细节,以使行文连贯。
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I watch TV until nearly 12 o’clock, so I could not go over my lessons. This morning I got up very late that I had to hurry to school without breakfast yet I was late of the first class. When I entered the classroom, the maths teacher has to stop explaining an important problem, and all the eyes fixed upon me. My face turned to red. Something even worse happened to me in the English classes. The teacher asked me to recite the text, but I could speak nothing but sorry, so I did not spend any time preparing my lessons. The teacher looked at me with his coldly eyes. I stood at my bench without daring to raise my head. What a terrible day I had! I will never do anything like this.
第二节 书面表达(满分25分)
假如你是李华,你从某网站上了解到一家美国公司生产了一种新款的数码相册,你对此很感兴趣,希望了解更多关于这一产品的信息。请根据以下要点给这家公司发一封电子邮件:
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