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Exercise---chapter 12

Exercise---chapter 12

1) A solid has a very high melting point, great hardness, and poor electrical conduction. This is a(n) ____ solid.

A) ionic

B) molecular

C) metallic

D) covalent network

E) metallic and covalent network

2) Crystalline solids differ from amorphous solids in that crystalline solids have ________.

A) appreciable intermolecular attractive forces

B) a long-range repeating pattern of atoms, molecules, or ions

C) atoms, molecules, or ions that are close together

D) much larger atoms, molecules, or ions

E) no orderly structure

3) An alloy is a________.

A) heterogeneous mixture of two metals.

B) pure metal.

C) metallic material that is composed of two or more elements.

D) nonmetal with some properties of a metal.

E) mineral containing two or more metals.

4) What is the typical effect of the addition of an interstitial element on the properties of a metal?

A) increase in malleability and corrosion resistance

B) increase in hardness and strength, decrease in ductility

C) decrease in melting point and increase in ductility

D) decrease in conductivity and increase in brittleness

E) increased surface luster

5) The properties of graphene include ______.

A) high strength

B) low thermal conductivity

C) a zero energy gap

D) A and C

E) A, B and C

6) The _____ lattice is one of the seven primitive three-dimensional lattices in which the relationship between the lattice vectors a, b, and c can be written as: a≠ b≠ c

A) monoclinic

B) hexagonal

C) rhombohedral

D) tetragonal

E) cubic

7) Gallium crystallizes in a primitive cubic unit cell. The length of the unit cell edge is 3.70 ?. The radius of a Ga atom is ___ ?.

A) 7.40

B) 3.70

C) 1.85

D) 0.930

E) Insufficient data is given.

8) CsCl crystallizes in a unit cell that contains a Cs+ion at the center of a cube and a Cl-ion at each corner. The unit cell of CsCl is ____.

A) close packed

B) body-centered cubic

C) face-centered cubic

D) amorphous

E) primitive cubic

9)The formation of a condensation polymer generally involves ________.

A) the addition of a plasticizer

B) the mixing of sulfur with an addition polymer

C) the elimination of a small molecule

D) the vaporization of a plasticizer

E) the formation of significant crosslinking

10) Inorganic compounds that are semiconductors have an average of___ valence electrons.

A) 1

B) 2

C) 3

D) 4

E) 5

Answers:

01-05:DBCBD 06-10:ACBCD

新概念英语第二册第十二课教案

Lesson 12 Goodbye and good luck New Expressions: 1 luck [l?k] n.运气,幸运 2 captain ['k?pt?n] n.船长 3 sail [seil] v.航行 4 harbour ['ha:b?] n.港口 5 proud [praud] a.自豪 6 important [im'p?:t?nt] a.重要的 Notes: 1. luck: 运气,幸运 bad [hard, ill, tough] luck 不幸, 倒霉 good luck 幸运 We wish you luck. 祝你好运。 Good luck to you! 祝你成功! He came to Beijing to try his luck. 他来到北京,想碰碰运气。 You never know your luck. 你也许会走运的。 联想:(1) lucky: 幸运的,运气好的 a lucky dog 幸运儿 a lucky day 吉日 He is a lucky dog. 他是个幸运的家伙。 You are lucky to be alive after being in that accident. 你真幸运,经过那场车祸还能生还。 (2) unlucky: 不幸的 Friday is believed to be an unlucky day. 星期五被认为是不吉利的日子。 You were just unlucky. 你只是运气不好。 She was unlucky to catch a cold on the first day of her holiday. 她太倒霉了,休假第一天就感冒了。 It's considered unlucky to walk under a ladder. 从梯子下面走过被认为是不吉利的。 2. sail: 航行 Can you sail a boat? 你会驾驶船只吗? The ship sails for Shanghai tomorrow. 这船明天开往上海。 This ship sails for New York on Monday. 这船将于星期一开往纽约。 The fleecy clouds sailed across the sky. 白云飘过天空。 The duchess sailed into the room. 公爵夫人轻盈地走进了房间。 He sailed through his exams. 他顺利地通过了考试。 3. harbour: 港口 This harbour is a natural harbour. 这个港口是天然港。 They brought the boat into the harbour and dropped (the) anchor. 他们把船开进海港下锚

《新概念英语》第二册第12课

Lesson 12 Goodbye and good luck 再见,一路顺风 1:Our neighbor, Captain Charles Alison, will sail from Portsmouth tomorrow. We shall meet him at the harbour early in the morning. 1):一般将来时:一般将来时表示将来某个时间将要发生的动作或存在的状态,亦表示将来经常或重复发生的动作,常与表示将来的时间状语连用,如:tomorrow,next year,soon等。表示将来时间的语法手段常见的至少有5种,即“shall/will + 动词原形”;“be going to + 不定式”;“be + -ing”;“be to + 不定式”以及一般现在时。 1.1 一般将来时的构成 肯定句:主语+ shall/will + 动词原形... 否定句:主语+ shall/will + not + 动词原形... 疑问句:Shall/Will + 主语+ 动词原形...? 疑问代词/疑问副词 + shall/will + 主语+ 动词原形...? 1.2 一般将来时的肯定句 句型:主语+ shall/will + 动词原形.... 在书面语中,如果主语是第一人称,常用“助动词shall + 动词原形”构成一般将来时的肯定句,即“I/we + shall + 动词原形”;shall可缩写为'll: If I have time tomorrow,I think I'll get a haircut.如果我明天有时间,我想去理个发。 在口语中,所有的人称都可以用will,即“主语(所有人称)+ will + 动词原形...”;will可缩写为'll: Some day,I'll tell you.将来某一天我会告诉你的。 1.3 一般将来时的否定句:句型:主语+ will/shall + not + 动词原形... 一般将来时的否定句是在will/shall后加not;will not可缩写为won't;shall not可缩写为shan't:Mary won't go to the party.玛丽不会去参加晚会。 1.4 一般将来时的一般疑问句句型:Shall/Will + 主语+ 动词原形... 回答方式:Yes,主语+ shall/will. No,主语+ shall/will + not. 一般将来时的一般疑问句是将助动词shall/will置于主语之前(大写shall/will的第一个字母),在句尾加问号;这种语序是主语和谓语倒装语序: Will he come? 他来吗? Will you be at our next meeting? 我们下次开会你来吗? Will you be free tonight? —Yes,I will./No,I won't(be free).今晚你有空吗? ——是,我有空。/不,我没有空。 Will they be here tomorrow? —Yes,they will./No,they won't.他们明天到这儿来吗? ——是,他们明天来。/不,他们明天不来。 Shall we be back in time? —Yes,we shall./No,we shall not.我们将及时回去吗? ——是的。/不,我们不赶回去。 1.5 一般将来时的特殊疑问句 句型:疑问代词/疑问副词+ shall/will + 主语+ 动词原形... 一般将来时的特殊疑问句是将疑问代词/疑问副词置于助动词shall/will之前(shall/will的第一个字母无需大写),和一般疑问句差不多,在句尾加问号;这种语序是主语和谓语倒装语序。就主语提问时,将疑问代词或带有疑问限定词的名词词组置于助动词shall/will之前,在句尾加问号;这种语序是陈述句语序: 1

新概念英语第二册第12课课文讲解

单词学习 luck n. 运气,幸运 captain n. 船长 sail v. 航行 harbour n. 港口 proud adj. 自豪 important adj. 重要的 ★luck n. 运气, 幸运 good luck 祝你好运 bless you 保重(比如在别人打喷嚏时说的话) lucky adj. 幸运的 lucky dog 幸运儿 lucky day 幸运日 It’s my lucky day. 今天我真幸运 luckily adv. 幸运地 unlucky adj. 不幸的 ★captain队长,船长 captain+人名,表示“某队长/船长” ★sail v. 航行 ① vi. (船)航行,扬帆行驶 The ship is sailing for New York. 这条船正驶向纽约 ② vi. (人)乘船航行 I want to sail around the world. 我想乘船环球旅行 ③ n. 帆,篷 This boat has white sails. 这个船的帆是白色的 ★proud adj. 自豪,自满 ①be proud of 以……为自豪,为(某人)感到自豪 Parents are proud of their children. 父母为自己的孩子感到自豪 ②be pround to do sth很骄傲的做某事 I am pround to call you my friend.我很骄傲地称你是我的朋友。 pride n. 自豪 have/take pride in 以……为自豪 He has great pride in his ability. 他对自己的能力感到 (非常) 骄傲We take a lot of pride in our country.我们为我们的国家感到自豪。 ★important adj. 重要的 The matter is important to us. 那件事对我们很重要 It is important for you to do that. 对你来说,做那件事是很重要的importance n. 重要,重要性 She stressed the importance of this work. 她强调了这个工作的重要性 课文讲解: neighbour, Captain Charles Alison, will sail from Portsmouth tomorrow. 我们的邻居查尔斯·艾利森船长明天就要从朴次茅斯启航了。

新概念英语第二册 课后答案 第十二课

新概念英语第二册课后答案第十二课Lesson 12 1. c 根据课文第3-4行Topsail is a famous little boat. It has sailed across the Atlantic many times, 只有c能够说明为什么Topsail is famous ,而其他3个选择都不符合逻辑。 2. c 根据课文最后一句He will take part in an important race across the Atlantic, 只有c. will be in the race across the Atlantic 同这句意思相同,而其他3个选择课文中都没有提到。 3. a 本句是个关系从句,需要一个相对应的关系代词引导。 b. whose his 不合乎语法,这两个词不能用在一起; c. his 不是关系代词; d. of whom 不合乎题目意思; 只有a. whose 是关系代词,符合题目意思,所以应该选a. 4. d 本句中的Portsmouth是一个地名(港口),在某个地方一般要用介词in或at, at 是指在小的地点或空间,所以只能选d, at. 其他3个选择都不能表示在某个地点。 5. d 只有d. the name of which 符合语法,其他3个选择都不对。

6. a 要选出与前面句子中的plenty of (充足的)意思相同的词。 b. almost enough(几乎是充足的)意思不够准确 c. less than enough(不充足的)意思相反, d. hardly enough(几乎不够)意思相反, 只有a. enough(充足)是plenty of 的同义词。 7. d a. say him goodbye 不符合语法; b. tell him goodbye 和 c. tell goodbye to him 都不符合习惯用法,意思上也讲不通;只有 d. say goodbye to him 最符合语法。 8. a 只有a. near才最符合题目意思。b. a long way from,和 c. in a different town from 都与题目意思相反。d. next door(隔壁)后面缺少介词to,不合乎语法 9. c 只有c. often(经常)最接近前面句子中的many times 的含义,而其他3个选择a. sometimes(有时),b. always(总是),d. usually(通常)在意思上不够接近many times. 10. d 前面句子中的词组set out是"出发,启程"的意思。只有d. the journey begins(旅程开始)最接近set out的含义,其他3个选择a. the trip ends, b. the journey ends, c. voyage stops都有“旅程结束”的意思,正好和题目意思相反。 11. a

新概念英语第二册第12课资料

新概念英语第二册第 12课

Lesson 12 Goodbye and good luck 再见,一路顺风 Our neighbour, Captain Charles Alison, will sail from Portsmouth tomorrow. We'll meet him at the harbour early in the morning. He will be in his small boat, Topsail. Topsail is a famous little boat. It has sailed across the Atlantic many times. Captain Alison will set out at eight o'clock, so we'll have plenty of time. We'll see his boat and then we'll say goodbye to him. He will be away for two months. We are very proud of him. He will take part in an important race across the Atlantic. New words and expressions 生词和短语 luck n. 运气,幸运captain n. 船长sail v. 航行 harbour n. 港口 proud adj. 自豪important adj. 重要的 参考译文 我们的邻居查尔斯.艾利森船长明天就要从朴次茅斯启航了。明天一大早我们将在码头为他送行。他将乘坐他的“涛波赛”号小艇。“涛波赛”号是艘有名的小艇,它已经多次横渡大西洋。艾利森船长将于8点钟启航,因此我们有充裕的时间。我们将参观他的船,然后和他告别。他要离开两个月,我们真为他感到自豪,他将参加一次重大的横渡大西洋的比赛。 1.Goodbye and good luck 再见,一路顺风 Good luck! 这一祝愿语在英语中比“祝你好运!”在中文中使用的范围要宽得多。新学期开始老师会对学生说Good luck!,监考人员也会在开考前对考生说Good luck!,甚至平常的时候再见也可以在“再见”之后再加一个Good luck!,从而一起说成:Goodbye and good luck! luck[l?k] n. [u] 1. good things that happen to you by chance, not because of your own efforts or abilities好运;幸运;侥幸 e.g. 如果一切顺利的话,我们可在天黑前回到家。With (any) luck, we’ll be home before dark. 我们祝愿她在新的事业中一帆风顺。We wish her luck in her new career.

新概念英语第二册第十二课后习题答案

新概念英语第二册第十二课后习题答案 Lesson 12 1. c 根据课文第3-4行 Topsail is a famous little boat. It has sailed acr oss theAtlantic many times, 只有c能够说明为什么 Topsail is famous ,而其他3个选择都不符合逻辑。 2. c 根据课文最后一句 He will take part in an important race across the Atlantic,只有 c. will be in the race across the Atlantic同这句意思相同,而其他3个选择课文中都没有提到。 3. a 本句是个关系从句,需要一个相应的关系代词引导。 b. whose his 不合乎语法,这两个词不能用在一起; c. his 不是关系代词; d. of whom 不合乎题目意思;只有a. whose 是关系代词,符合题目意思,所以应该选a. 4. d 本句中的Portsmouth是一个地名(港口),在某个地方一般要用介词in或at, at 是指在小的地点或空间,因此只能选d, at. 其他3个选择都不能表示在某个地点。 5. d只有d. the name of which 符合语法,其他3个选择都不对。 6. a 要选出与前面句子中的plenty of (足够的)意思相同的词。

b. almost enough(几乎是足够的)意思不够准确 c. less than enough(不充足的)意思相反, d. hardly enough(几乎不够)意思相反,只有 a. enough(足够)是plenty of 的同义词。 7. d a. say him goodbye 不符合语法; b. tell him goodbye 和 c. tell goodbye to him都不符合习惯用法,意思上也讲不通;只有 d. say goodbye to him 最符合语法。 8. a只有a. near才最符合题目意思。b. a long way from,和 c. in a different town from都与题目意思相反。 d. next door(隔壁)后面缺少介词to,不合乎语法 9. c 只有 c. often(经常)最接近前面句子中的many times 的含义,而其他3个选择 a. sometimes(有时),b. always(总是),d. usually(通常)在意思上不够接近many times. 10. d前面句子中的词组set out是"出发,启程"的意思。只有 d. the journey begins(旅程开始)最接近setout的含义,其他3个选择a. the trip ends, b. the journey ends, c. voyagest ops都有“旅程结束”的意思,正好和题目意思相反。 11. a只有选 a. be 才最符合前面句子He will take part in a race 的含义,而其他3个选择意

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