单选题
阅读下面短文，从短文后所给的[A]、[B]、[C]三个选项中选出能填人相应空白处的最佳选项。

A hundred{{U}} (41) {{/U}}years ago there were a lot of dinosaurs (恐龙) in the world. Some lived on land. Some lived in the sea. Some{{U}} (42) {{/U}}fly. A lot of them{{U}} (43) {{/U}}very large and some had horns (角) or long teeth{{U}} (44) {{/U}}the monsters (怪物) in films. Most of the dinosaurs were plant-eaters, but some of them could kill{{U}} (45) {{/U}}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{{U}} (46) {{/U}}dead.{{U}} (47) {{/U}}happened to them?
Some scientists say that about 65 million years ago the world's climate (气候){{U}} (48) {{/U}}cold (寒冷的，伤风) and this cold climate killed the dinosaurs.
Now we eau only see dinosaur bones (骨骼) in{{U}} (49) {{/U}}, but we can not see a{{U}} (50) {{/U}}dinosaur any more.

A、

[A] hundred
B、

[B] thousands
C、

[C] million

【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。

A、

[A] were
B、

[B] could
C、

[C] would

【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。

A、

[A] lived
B、

[B] were
C、

[C] had

【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。

A、

[A] like
B、

[B] with
C、

[C] as

【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。

A、

[A] to
B、

[B] but
C、

[C] and

【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。

A、

[A] all
B、

[B] not
C、

[C] both

【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。

A、

[A] How
B、

[B] Why
C、

[C] What

【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。

A、

[A] started
B、

[B] got
C、

[C] was

【正确答案】 B

【答案解析】get cold这里有变冷的意思。

A、

[A] museums
B、

[B] picture
C、

[C] history

【正确答案】 A

【答案解析】显然只有museum才有恐龙的骨骼化石。

A、

[A] big
B、

[B] real
C、

[C] dead

【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。