高二英語(yǔ)上冊(cè)全冊(cè)教案3
a. page 27. first let students finish part 1,2
b. check the answers with the whole class.
c. give students 3minutes to finish part 3.
d. let the students read part 4 for a while and finish it.
e. turn to page 63. first let the students finish 1and 2 and check the answers.
step ⅲ preparation
show some sentences on the blackboard.
a. a tree has fallen across the road.
b. you are a student.
c. to find your way can be a problem.
d. smoking is bad for you.
e. “how do you do?” is a greeting.
f. what she said is not yet known.
g. that we shall be late is certain.
h. it’s certain that we shall be late .
t: what part does the underlined part serve as in each sentence? or find its subject in each sentence.
step ⅳ grammar
1. give the students some time to find the sentences in the passage. the collect answers from the class.
2. show typical examples of how to make a subject clause. guide the ss to find out what changes we have to make when we make a sentence or combine two sentences using subject clause. teacher shows the example and ss write down the sentences.
3. turn to page 64. read the following passage quickly and finish the eight sentences.
4. have a discussion in pairs. the topic is my dream. one talks about the problems in his study or life, another gives some advice. remind the students to use the following structures
a. my problem is…
b. my trouble is…
c. the question is…
d. my advice is…
e. what i think about it is…
f. the fact is…
g. my suggestion is…
step ⅴhomework
1. finish part 3(p23)
2. finish part 3(p64)
added material:
什么是黑洞？
就是在宇宙中有那么一些點(diǎn)，這些點(diǎn)的體積趨向于零而密度變得無(wú)窮大，由于具有強(qiáng)大的吸引力，物體只要進(jìn)入離這個(gè)點(diǎn)一定距離的范圍內(nèi)，就會(huì)被這個(gè)強(qiáng)大的引力吸收掉，連光線也不例外。因此任何進(jìn)入這個(gè)范圍的物體都無(wú)法再逃出來(lái)，就是說(shuō)，沒(méi)有任何信號(hào)能夠從這個(gè)范圍內(nèi)傳出，因此這個(gè)范圍的界限被稱(chēng)作視界，里面的情形人類(lèi)無(wú)法看到。所以科學(xué)家給它起了個(gè)名字叫黑洞，英文就是black hole。 一顆燃燒盡了的恒星由于自身的重力而不斷坍縮，最后就會(huì)形成黑洞。
歷時(shí)30年霍金改觀點(diǎn) 稱(chēng)黑洞能“吸”能“吐”
從事宇宙黑洞研究近三十年的世界天體物理學(xué)泰斗斯蒂芬•霍金在前不久承認(rèn)“黑洞悖論”有誤之后，21號(hào)，他在愛(ài)爾蘭都柏林舉行的一個(gè)學(xué)術(shù)研討會(huì)上終于就自己的新發(fā)現(xiàn)向外界進(jìn)行了詳細(xì)闡述。
黑洞是宇宙中引力極強(qiáng)的區(qū)域。19世紀(jì)70年代，霍金首次提出黑洞能夠輻射能量的理論，但是在引入這一理論的同時(shí)，霍金也制造了物理學(xué)上的一個(gè)巨大難題，因?yàn)樗J(rèn)為