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4.2.2 等差数列的前n项和公式 同步练习 一、选择题 1. 已知等差数列 an 的前 n 项和为 Sn，若 a3+a4=6，则 S6=    A． 6 B． 12 C． 18 D． 36 2. 已知

4.3.2 等比数列的前n项和公式 同步练习 一、选择题 1. 等比数列 an 中，a2=9，a5=243，则 an 的前 4 项和为    A． 81 B． 120 C． 168 D． 192 2

等比数列的概念 同步练习 一、选择题 1. 在单调递减的等比数列 an 中，若 a3=1，a2+a4=52，则 a1=    A． 2 B． 4 C． 2 D． 22 2. 在等比数列 an 中，已知 a3=32，S3=92，则公比

4.2.1 等差数列的概念 同步练习 一、选择题 1. 若数列 an 的通项公式为 an=2n+5，则此数列是    A．公差为 2 的等差数列 B．公差为 5 的等差数列 C．首项为 5 的等差数列

统编版语文选择性必修下册课文注释汇总 统编版语文课文注释汇总（选择性必修下册） （红体字部分是重点词汇，须重点积累识记。） 氓 〔蚩（chī）蚩〕忠厚的样子。 〔贸〕交易，交换。 〔匪〕不是。 〔来

部编版新教材选择性必修课内成语集合 部编版新教材高二语文选择性必修上册课内成语集合 《中国人民站起来了》 不可磨灭：永远消失不了。指事迹言论等将始终保留在人们的记忆中。 不屈不挠：比喻在压力和困难面前不屈服，表现十分顽强

5.2　在品味情感中成长 课时训练 一、单项选择题（本大题共15小题，共30分） 1. 美好的情感促进我们的精神发展，让我们身心愉悦。以下对美好情感的认识正确的是（） ①我们可以通过阅读、与人交往、

第2课时 溶解度 一 选择题 1．在20 ℃时，将40 g氯化钠固体加入100 g水中，充分搅拌后，有4 g固体未溶解。下列说法正确的是(　　) A．20 ℃时，氯化钠的溶解度为36 g B．该溶液不能继续溶解硝酸钾固体

 9.2 溶解度 一、单选题 1．下列关于溶液的叙述，正确的是（ ） A．溶液都是均一、稳定的液体 B．饱和溶液就是不能再溶解任何物质的溶液 C．饱和溶液的质量一定比不饱和溶液的质量大 D．一定温度

1.To analyse how the present continuous tense is used to express future plans.2.To learn the language situations of using this grammar.3.To apply the usage to talking and writing future plans.

1.Figure out the main structures of the passage.2.Know the first day experiences and feelings following the time order.3.Judge the writing purpose and intended readers of the passage.4.Express ideas on the given topics by critical thinking.

1.Summarise the main idea of the conversation and sort out measures taken before,during and after an earthquake.2.Report safety instructions according to different disasters.3.Arouse the awareness of disaster preventions.

history through this amazing language.  随着中国在全球事务中扮演着越来越重要的角色,越来越多的国际学生开始通过汉语这一奇妙的语言欣赏中国的文化和历史。 【词块】play

1.To know how to make reservations and what to reserve before travelling.2.To practise the tip of listening—listening for the key words.3.To know the formal and polite patterns and expressions in making a reservation.4.To role-play a phone call to make reservations with a partner.

1.Get the gist of the text and identify the type and language features of the text.2.Analyse the sample and summarise the key elements in writing a summary.3.Write a summary of the passage“THE NIGHT THE EARTH DIDNT SLEEP”.

1.Explore different kinds of English and understand the diversity of English.2.Figure out the main facts and summarise the main ideas when listening.3.Master effective communication strategies and methods of communicating in English.

indirect object and direct object 小结6:在动词后方所跟的双宾语中,表示物的叫作直接宾语direct object(简称“直宾”),表示人的叫作间接宾语(indirect

1.Learn about the basic information of the Tangshan earthquake.2.Identify the language features of literary journalism and the structures of the text.3.Appreciate the figures of speech and writing skills used in the text.4.Grasp and use some words and phrases to describe a natural disaster.课堂探究

1.To get familiar with the development history of the Chinese writing system.2.To apply prediction and scanning strategies for main ideas in reading.3.To identify the main structure of the passage and talk about a topic through the timeline.4.To use some important words and phrases to describe the development of Chinese writing system.

学习目标1.To know how to get ready for a travel.2.To grasp the tip of listening—listening to the key words.3.To talk about the plans using “be doing”.4.To know how to prepare for a travel.