- UID
- 37100
- 在线时间
- 小时
- 注册时间
- 2004-5-29
- 最后登录
- 1970-1-1
- 主题
- 帖子
- 性别
- 保密
|
阅读03-01-31
Questions 31-39
Perhaps one of the most dramatic and important changes that took place in the
Mesozoic era occurred late in that era, among the small organisms that populate the
uppermost, sunlit portion of the oceans--the plankton. The term "plankton" is a broad
Line one, designating all of the small plants and animals that float about or weakly propel
(5) themselves through the sea. In the late stages of the Mesozoic era. during the Cretaceous
period, there was a great expansion of plankton that precipitated skeletons or shells
composed of two types of mineral: silica and calcium carbonate.
This developmentradically changed the types of sediments that accumulated on the seafloor, because,while the organic parts of the plankton decayed after the organisms died, their mineralized
(10) skeletons often survived and sank to the bottom. For the first time in the Earth's long
history, very large quantities of silica skeletons, which would eventually harden into rock,
began to pile up in parts of the deep sea. Thick deposits of calcareous ooze made up of
the tiny remains of the calcium carbonate-secreting plankton also accumulated as never
before. The famous white chalk cliffs of Dover, in the southeast of England, are just one
(15) example of the huge quantities of such material that amassed during the Cretaceous
period; there are many more. Just why the calcareous plankton were so prolific during
the latter part of the Cretaceous period is not fully understood. Such massive amounts
of chalky sediments have never since been deposited over a comparable period of time.
The high biological productivity of the Cretaceous oceans also led to ideal conditions
(20) for oil accumulation. Oil is formed when organic material trapped in sediments is slowly
buried and subjected to increased temperatures and pressures, transforming it into
petroleum. Sediments rich in organic material accumulated along the margins of the
Tethys Seaway, the tropical east-west ocean that formed when Earth's single landmass
(known as Pangaea) split apart during the Mesozoic era. Many of today's important oil
(25) fields are found in those sediments--in Russia, the Middle East, the Gulf of Mexico, and
in the states of Texas and Louisiana in the United States.
31. What does the passage mainly discuss?
(A) How sediments were built up in oceans during the Cretaceous period
(B) How petroleum was formed in the Mesozoic era
(C) The impact of changes in oceanic animal and plant life in the Mesozoic era
(D) The differences between plankton found in the present era and Cretaceous plankton
偶选C, 理由如下：
首句描述in M era最重要的变化发生于plankton， 首段末句描述沉淀为skeleton or shell的plankton急剧增加。第二段首句为该段的T.S, 即plankton的急剧增加对海底沉淀物造成的影响；第三段首句为该段的T.S， 即plankton的急剧增加为石油的积累形成了最好的条件。
因此，全文都在描述In M era plankton（designating all of the small plants and animal）的变化带来的影响，所以C.
网上提供答案为A, 不明白。。
 |
|
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2004-11-11 21:20:00
