Astronomy教案
5. the author infers us that if we want to the life continue on the earth, what should we do?
a. we should produce more carbon dioxide to cause global warming.
b. we should solve the problem of global warming as soon as possible.
c. we should bear less people and think about a new way to grow more crops.
d. we should be worthy of water.
(key: ddbab)
notes to some difficult sentences
1. after the “big bang ” the earth was just a cloud of energetic dust.隨著“轟隆”一聲巨響，地球就成為一個云團，充滿著具有能量的塵埃。
big bang(big-bang cosmology) 大爆炸宇宙學。
2. it exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earth’s atmosphere. 它（地球）巨大的爆炸噴出了烈火與巖石，最終產生了水蒸汽、二氧化碳、氧、氮和其他多種氣體，從而形成了地球的大氣層。
in time: sooner or later; eventually 遲早；最后。
i’ll see him in time. 總有一天我會遇見他。
in time(for sth/ to do sth) : not late 及時；不遲。
she will be back in time to prepare dinner. 她來得及回來準備晚飯。
in/out of time: in/not in the correct time 合/不合節怕。
the audience clapped in time to the music. 觀眾合著音樂的節拍拍手。
（sth）be to (do): (something) will definitely happen, or it must happen 不可避免要發生或必須發生。
they said goodbye, little knowing that they were never to meet again. 他們彼此說了再見，幾乎不知道再也不可能見面了。
she is to be honored for this great work. 她（一定）會因這部著作而獲得榮譽。
mr. clark said to his daughter, “you are to be home by 10 o’clock at the latest.” 克拉克先生對他的女兒說：“你必須在10點之前到家�！�
3. nobody knew that it was going to be different from other planets going round the sun. 誰也不知道地球會別于環繞太陽運轉的其它行星。
（sb/sth）be different from: not like someone or something else in one or more ways 與……不同。
city life is quite different from country life. 都市生活與鄉村生活是非常不同的。
注意：（1）強調different時用very, much, quite, entirely, totally等詞。（2）有時，美語口語中用than，英語口語中用to來代替from。
going round the sun 為現在分詞短語，作定語，表示一般的動作。例如：
men breaking the law will be punished.
men who break the law will be punished. 違法的人要受到處罰。
現在分詞短語作定語，也可以表示進行的動作。例如：
can you see the girl dancing with your boyfriend?
can you see the girl who is dancing with her boyfriend? 你能看見與男友跳舞的那個姑娘嗎？
4. it allowed the earth to dissolve harmful gases, which had become part of the earth’s atmosphere, into the oceans and seas. 它使地球把曾經存在于大氣層中的有害氣體溶解在海洋里。