问题 写作题

书面表达(10分)

以“My Best School Trip ”为题写一篇60字左右的短文,介绍你的参观情况。

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答案

My Best School Trip

Last school trip, I went to the beach with my classmates on the bus. We had great fun playing on the beach, swimming in the water, surfing, fishing and we took many photos there. Later we visited the Blue Water Aquarium. We saw many different kinds of fishes there. There were sharks, seals, octopuses and so on. Some were big, others were small. In the afternoon, we went to the shop and bought many gifts. Finally, we had a big sea food dinner. We were tired, but really happy. It was my best school trip.

本题是写一篇给定题目的书面表达,写作的话题为我最好的学校旅行,写作的内容包括我们的去地,所去的时间,具体所做的事,旅行的整个过程,可以按照时间顺序,在写作时应注意主要使用一般过去时,同时应注意语言的准确性和连贯性。

实验题

过碳酸钠(2Na2CO4·3H2O)是一种新型高效固体漂白杀菌剂,它具有无臭、无毒、无污染的特点,被大量应用于洗涤、印染、纺织、造纸、医药卫生等领域中。依托纯碱厂制备过碳酸钠可降低生产成本,其生产流程如下:

试回答下列问题:

(1)过碳酸钠溶于水后所得溶液显        (填“酸性”、“碱性”或“中性”)。请用离子方程式表示:______________________。

(2)操作①需要的玻璃仪器有              (填写仪器名称)。

(3)工业纯碱中常含有少量NaCl,某校化学课外活动小组设计如图所示装置,测定工业纯碱中Na2CO3的含量。

①要检验工业纯碱中杂质的存在,最好选用下列试剂中的__________(选填序号)。

a. 氢氧化钡溶液       b. 稀硝酸        c. 硫氰化钾溶液       d. 硝酸银溶液

②检验装置B气密性的方法是:塞紧带长颈漏斗的三孔橡胶塞,夹紧弹簧夹后,从漏斗注入一定量的水,使漏斗内的水面高于瓶内的水面,停止加水后,若观察到                说明装置不漏气。

③装置A的作用是                                    ,装置C中的试剂为         

④某同学认为在D装置后应再连接E装置(装有适当试剂),你认为是否必要?        (选填“必要”或“不必要”),判断的理由是                                                             

单项选择题