单选题 A hundred (41) years ago there were a lot of dinosaurs (恐龙) in the world. Some lived on land. Some lived in the sea. Some (42) fly. A lot of them (43) very large and some had horns (角) or long teeth (44) the monsters (怪物) in films. Most of the dinosaurs were plant-eaters, but some of them could kill (45) eat very big animals.
The world was full of dinosaurs for 135 million (百万，百万个) years. 60 million years ago, however (然而，不管怎样), they were (46) dead. (47) happened to them?
Some scientists say that about 65 million years ago the world's climate (气候) (48) cold (寒冷的，伤风) and this cold climate killed the dinosaurs.
Now we eau only see dinosaur bones (骨骼) in (49) , but we can not see a (50) dinosaur any more.

【正确答案】 C
【答案解析】从第二段"60 million years ago"的提示，这里应该填million。
【正确答案】 B
【答案解析】后面fly用的是原形，再从行文的时态一致性考虑，选B最佳。
【正确答案】 B
【答案解析】由后面的large立刻排除[A]lived和[C]had。选[B]were。
【正确答案】 A
【答案解析】like和as都可以做“像”讲；区别在于：like是介词，后接名词或代词；as是连词，一般后接一个从句。
【正确答案】 C
【答案解析】显然要用一个并列连词and连接两个动词kill和eat。
【正确答案】 A
【答案解析】all指三者以上的“都”；both指二者的“都”。显然奉题选A。
【正确答案】 C
【答案解析】What happened to them，在它们身上发生了什么事呢。
【正确答案】 B
【答案解析】get cold这里有变冷的意思。
【正确答案】 A
【答案解析】显然只有museum才有恐龙的骨骼化石。
【正确答案】 B
【答案解析】要与前半句构成转折关系，填real最佳，与前半句中的bones相对应。