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
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discovery was found in Leye County, Guangxi Zhuang autonomous region. Leye County is famous
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“the museum of sinkholes”. People
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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
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. These holes
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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
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great sizes.
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are sinkholes important?
Besides looking cool, karst caves and sinkholes can be the
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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
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or described by science until now,” said the leader of the Chinese scientists who study sinkholes, Chen Lixin. This is
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the sinkholes are unknown to the outside world. That
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an environment for new species to form.
Sinkholes also hold lots of underground water. They are like water pipes in nature. They bring
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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
