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6. It is thought that millions of years ago this liquid mass pushed upward through cracks in the earth's crust.

It is thought that…是一個(gè)很常用的句型，類似的句型在英語中很多，比如：

1) It is / was， has been…， reported that…

2) It is / was， has been…， stated that…

3) It is / was， has been…， pointed out that…

4) It is / was， has been…， mentioned that…

5) It is / was， has been…， believed that…

7. A. There are only four areas where very many diamonds have been formed.

B. The first known area was in India， where diamonds were found thousands of years ago.

定語從句可分為限定性定語從句和非限定性定語從句。A句是限定性定語從句，B句是非限定性定語從句。A、B兩句中都是用關(guān)系副詞where來引導(dǎo)定語從句，修飾表示地點(diǎn)的名詞。請(qǐng)看下面的句子，注意限定性定語從句一般不用逗號(hào)隔開：

1) Is there a shop around where we can get some fruit? (附近有什么商店可以買到水果嗎?)

2) This is the place where we met yesterday. (這是我們昨天碰頭的地方。)

3) The small town， where he once worked， has turned to be a modern city. (他曾經(jīng)工作過的那座小城，已經(jīng)變成現(xiàn)代化的城市了。)

8. In the 1600's…(十七世紀(jì))

In the 1720's…(十八世紀(jì)二十年代)

In the 1800's…(十九世紀(jì))

請(qǐng)注意年代的表達(dá)方法，以上的年代也可以表達(dá)為in the 1600s; in the 1720s; in the 1800s.如果我們要表達(dá)“在十七世紀(jì)初(中、末)期”，則可以說in the early(mid， late) 1600's/1600s.

9. Diamonds became very popular with the kings and queens of Europe.

become / be popular with / among是一個(gè)常用詞組，意思是“受…歡迎”，

10. India's supply of diamonds was finally running out after 2，500 yeas of mining the stones.

Supply在句子中做名詞用，意思是“供應(yīng)”。Supply常常可以做動(dòng)詞用，意思是“供給，提供”。

run out是一個(gè)常用詞組，意思是“用完，用盡”。請(qǐng)看例句：

1) Time is running out. We have to hurry. (時(shí)間快到了，我們得快點(diǎn)。)

2) My patience is running out. (我快要耐不住了。)

3) His luck seemed to have run out. (他的好運(yùn)似乎結(jié)束了。)

我們也可以用run out來表達(dá)類似的意思，但run out of的主語應(yīng)該是“某人”。如：

1) They have run out of money， so they have to find a job. (他們錢用完了，所以得找一份工作。)

2) I have run out of ink. (我的墨水用完了。)