三、完形填空
A team of Chinese scientists have found a new giant sinkhole (天坑). It’s 192 metres 1. What did they find at the 2? An ancient forest!
This 3 discovery was found in Leye County, Guangxi Zhuang autonomous region. Leye County is famous 4 “the museum of sinkholes”. People 5 about 30 sinkholes there before.
How do sinkholes form?
The karst landform (喀斯特地貌) is widely distributed (分布) in China. The karst landform is made when rainwater runs through little holes 6. These holes 7 grow into a cave. Over time, the cave can get so 8 that its top falls down slowly, opening up a sinkhole. The sinkholes in China are called wonders by George Veni, an expert in this field, because of 9 great sizes.
10 are sinkholes important?
Besides looking cool, karst caves and sinkholes can be the 11 to many kinds of plants, animals and microbes. “I won’t be surprised to know that some species (物种) in these caves have never been 12 or described by science until now,” said the leader of the Chinese scientists who study sinkholes, Chen Lixin. This is 13 the sinkholes are unknown to the outside world. That 14 an environment for new species to form.
Sinkholes also hold lots of underground water. They are like water pipes in nature. They bring 15 to 700 million people worldwide.
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A team of Chinese scientists have found a new giant sinkhole (天坑). It’s 192 metres 1. What did they find at the 2? An ancient forest!
This 3 discovery was found in Leye County, Guangxi Zhuang autonomous region. Leye County is famous 4 “the museum of sinkholes”. People 5 about 30 sinkholes there before.
How do sinkholes form?
The karst landform (喀斯特地貌) is widely distributed (分布) in China. The karst landform is made when rainwater runs through little holes 6. These holes 7 grow into a cave. Over time, the cave can get so 8 that its top falls down slowly, opening up a sinkhole. The sinkholes in China are called wonders by George Veni, an expert in this field, because of 9 great sizes.
10 are sinkholes important?
Besides looking cool, karst caves and sinkholes can be the 11 to many kinds of plants, animals and microbes. “I won’t be surprised to know that some species (物种) in these caves have never been 12 or described by science until now,” said the leader of the Chinese scientists who study sinkholes, Chen Lixin. This is 13 the sinkholes are unknown to the outside world. That 14 an environment for new species to form.
Sinkholes also hold lots of underground water. They are like water pipes in nature. They bring 15 to 700 million people worldwide.
(
B
) 1. A. tall B. deep C. thin D. long(
C
) 2. A. end B. top C. bottom D. start(
B
) 3. A. terrible B. amazing C. early D. careful(
A
) 4. A. as B. of C. to D. with(
D
) 5. A. made B. dug C. reached D. found(
C
) 6. A. upstairs B. downstairs C. underground D. overhead(
C
) 7. A. luckily B. easily C. slowly D. heavily(
D
) 8. A. small B. beautiful C. straight D. big(
D
) 9. A. his B. your C. our D. their(
A
) 10. A. Why B. When C. Where D. What(
B
) 11. A. school B. home C. office D. playground(
A
) 12. A. reported B. sold C. saved D. left(
A
) 13. A. because B. but C. if D. after(
B
) 14. A. hurts B. provides C. believes D. invents(
C
) 15. A. rain B. snow C. water D. food答案：1.B 2.C 3.B 4.A 5.D 6.C 7.C 8.D 9.D 10.A 11.B 12.A 13.A 14.B 15.C
解析：
【分析】
这是一篇关于中国科学家发现新天坑的完形填空，解题思路为：先通读全文把握主旨（介绍天坑的发现、形成及重要性），再结合语境、词义辨析、固定搭配及上下文逻辑逐个分析选项，确定每个空的正确答案。
【解析】
1. 考查形容词词义辨析。天坑的深度用deep，故选B。
2. 考查名词词义辨析。在天坑底部发现古森林，bottom符合语境，故选C。
3. 考查形容词词义辨析。发现古森林是令人惊奇的，amazing合适，故选B。
4. 考查固定搭配。be famous as意为“作为……出名”，故选A。
5. 考查动词词义辨析。之前发现约30个天坑，found符合，故选D。
6. 考查副词词义辨析。雨水流过地下的小洞，underground正确，故选C。
7. 考查副词词义辨析。洞慢慢变成洞穴，slowly符合，故选C。
8. 考查形容词词义辨析。洞穴足够大导致顶部坍塌，big合适，故选D。
9. 考查代词词义辨析。指代天坑的巨大尺寸，用their，故选D。
10. 考查疑问词。后文讲天坑的重要性，用Why提问，故选A。
11. 考查名词词义辨析。天坑是动植物和微生物的家园，home正确，故选B。
12. 考查动词词义辨析。物种未被报道或描述，reported符合，故选A。
13. 考查连词。解释原因用because，故选A。
14. 考查动词词义辨析。提供新物种形成的环境，provides合适，故选B。
15. 考查名词词义辨析。天坑带来水，water正确，故选C。
【答案】
1.B 2.C 3.B 4.A 5.D 6.C 7.C 8.D 9.D 10.A 11.B 12.A 13.A 14.B 15.C
【知识点】
完形填空解题技巧、词义辨析、固定搭配
【点评】
本文围绕天坑的发现、形成及生态价值展开，考查学生对词汇、语境逻辑的理解运用能力，整体难度适中，需结合上下文和基础词汇知识解题。
【难度系数】
0.5
这是一篇关于中国科学家发现新天坑的完形填空，解题思路为：先通读全文把握主旨（介绍天坑的发现、形成及重要性），再结合语境、词义辨析、固定搭配及上下文逻辑逐个分析选项，确定每个空的正确答案。
【解析】
1. 考查形容词词义辨析。天坑的深度用deep，故选B。
2. 考查名词词义辨析。在天坑底部发现古森林，bottom符合语境，故选C。
3. 考查形容词词义辨析。发现古森林是令人惊奇的，amazing合适，故选B。
4. 考查固定搭配。be famous as意为“作为……出名”，故选A。
5. 考查动词词义辨析。之前发现约30个天坑，found符合，故选D。
6. 考查副词词义辨析。雨水流过地下的小洞，underground正确，故选C。
7. 考查副词词义辨析。洞慢慢变成洞穴，slowly符合，故选C。
8. 考查形容词词义辨析。洞穴足够大导致顶部坍塌，big合适，故选D。
9. 考查代词词义辨析。指代天坑的巨大尺寸，用their，故选D。
10. 考查疑问词。后文讲天坑的重要性，用Why提问，故选A。
11. 考查名词词义辨析。天坑是动植物和微生物的家园，home正确，故选B。
12. 考查动词词义辨析。物种未被报道或描述，reported符合，故选A。
13. 考查连词。解释原因用because，故选A。
14. 考查动词词义辨析。提供新物种形成的环境，provides合适，故选B。
15. 考查名词词义辨析。天坑带来水，water正确，故选C。
【答案】
1.B 2.C 3.B 4.A 5.D 6.C 7.C 8.D 9.D 10.A 11.B 12.A 13.A 14.B 15.C
【知识点】
完形填空解题技巧、词义辨析、固定搭配
【点评】
本文围绕天坑的发现、形成及生态价值展开，考查学生对词汇、语境逻辑的理解运用能力，整体难度适中，需结合上下文和基础词汇知识解题。
【难度系数】
0.5