2017託福閱讀考前練習題及答案
導語:閱讀是託福英語中佔的比分比較多的題型,下面是YJBYS小編提供的'2017託福閱讀考前練習題,希望大家在閱讀中拿到更多的分數!
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 one, designating all of the small plants and animals that float about or weakly propel 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 development radically 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 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 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 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 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.
1. 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
2. The passage indicates that the Cretaceous period occurred
(A) in the early part of the Mesozoic era
(B) in the middle part of the Mesozoic era
(C) in the later part of the Mesozoic era
(D) after the Mesozoic era
3. The passage mentions all of the following aspects of plankton EXCEPT
(A) the length of their lives
(B) the level of the ocean at which they are found
(C) their movement
(D) their size
4. The word "accumulated" in line 8 is closest in meaning to
(A) depended
(B) matured
(C) dissolved
(D) collected
5. According to the passage , the most dramatic change to the oceans caused by plankton during the Cretaceous period concerned
(A) the depth of the water
(B) the makeup of the sediment on the ocean floor
(C) the decrease in petroleum-producing sediment
(D) a decline in the quantity of calcareous ooze on the seafloor
6. The "white chalk cliffs of Dover" are mentioned in line 14 of the passage to
(A) show where the plankton sediment first began to build up
(B) provide an example of a plankton buildup that scientists cannot explain
(C) provide an example of the buildup of plankton sediment
(D) indicate the largest single plankton buildup on Earth
7. The word "prolific" in line 17 is closest in meaning to
(A) fruitful
(B) distinct
(C) determined
(D) energetic
8. The word "ideal" in line 20 is closest in meaning to
(A) common
(B) clear
(C) perfect
(D) immediate
9. The word "it" in line 22 refers to
(A) biological productivity
(B) oil
(C) organic material
(D) petroleum
參考答案:CBBAA DCACC
-
2016託福閱讀解題技巧
在托福考試中,託福閱讀可能是比較令大家頭疼的一項了,對於託福閱讀怎麼練?也許是很多同學的問題,大家在備考的時候可以針對各個託福閱讀題型記性練習,瞭解一些關於託福閱讀評分標準的相關資訊,通過多做託福閱讀模擬題進行鍛鍊。首先要觀察的便是結構,而在託福閱讀學...
-
託福報考九大注意事項
託福報考需要注意哪些注意事項呢?以下是yjbys網小編整理的關於託福報考九大注意事項,供同學們參考。1、NEEAIDNEEAID是在託福報名網站,用來確認你身份的帳號,由於在託福放出考位的當天網路非常擁擠,即使是註冊ID這樣簡單的步驟,也很有可能佔用考生大量的時間,因此建...
-
託福常用副詞分類
TOEFL是一種針對母語非英語的.人進行的英語水平的考試。下面是關於託福常用副詞分類,希望大家認真閱讀!accordingly相應地、對應地Throughinternships,studentswillbecomefamiliarwiththecompanies’expectationstowardscompetitivegraduatesandbuildtheircaree...
-
2017年最新託福閱讀考試備考材料
Anidleyouth,aneedyage.以下是小編為大家搜尋整理的2017年最新託福閱讀考試備考材料,希望能給大家帶來幫助!更多精彩內容請及時關注我們應屆畢業生考試網!Borscht,whichissometimesalsospelledborschandborshch,isalovelyvegetablesoupthatisalmostalwaysmadewit...