A、 Most of the early diamond miners became wealthy later.
B、 Diamonds couldn't be formed without great heat and pressure of the volcano.
C、 The earliest known diamonds were discovered in the River Amazon.
D、 Explosions of the volcano can damage diamonds as well.

【正确答案】 B

【答案解析】解析：信息明示题。短文开头指出Diamonds were made as a result of great volcanic heat and pressure．故可知钻石是在火山高温和巨大压力下形成的。所以选B。

A、 Under the river bed.
B、 On the floor of the sea.
C、 In the volcanoes.
D、 At the foot of the mountains.

【正确答案】 C

【答案解析】解析：细节辨认题。文中指出It is in the narrow volcanic pipes that diamonds are found．钻石一开始是在火山里找到的。故选C。

A、 Diamond Hunting.
B、 Diamond—A Precious Stone.
C、 Diamond—Symbol of Fortune.
D、 How Is Diamond Formed and Found?

【正确答案】 D

【答案解析】解析：判断推测题。文章主要讲钻石的形成和发现的过程。故选D。