问题 填空题

在商店购买灯泡时,可发现灯泡内部的灯丝支架上附着少量红色物质──红磷,其作用是什么?__________。写出有关的化学反应的文字表达式:______________。

答案

除去灯泡中的氧气,延长灯泡的寿命;磷+氧气五氧化二磷

单项选择题
写作题
假设你是李华,你的朋友Lily向你询问有关CCTV International的情况,请根据下面表格内的提示用英文写一封回信,向你的同学介绍CCTV International。
频道名称
CCTV International
开播时间
2000年9月25日
类型
英语频道
 
喜欢的原因
主要介绍我国的政治、经济、文化、旅游、风土人情和社会等;24小时不间断广播的新闻节目,通过它你可以了解世界动态;可以练习英语听力
 
注意:
1.开头和结尾已给出;
2.词数:100个左右;
3.参考词汇:英语频道English-channel; 报道report; 国际事件international events.
Dear Lily,
       In the letter, you asked me something about CCTV International.                                                                
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                            
                                                                                                                                                       
                                                                            
Yours,
Li  Hua.