托福阅读历年真题精选30_第2页

32. The passage indicates that the Creiaceous 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

 

33. 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

 

34. The word "accumulated" in line 8 is closest in meaning to

(A) depended

(B) matured

(C) dissolved

(D) collected

 

35. 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

 

36. 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

 

37. The word "prolific" in line 16 is closest in meaning to

(A) fruitful

(B) distinct

(C) determined

(D) energetic

 

38. The word "ideal" in line 19 is closest in meaning to

(A) common

(B) clear

(C) perfect

(D) immediate

 

39. The word "it" in line 21 refers to

(A) biological productivity

(B) oil

(C) organic material

(D) petroleum