The word "laborious" in line 8 is closest in meaning to（）
A. unfamiliar
B. primitive
C. skilled
D. difficult
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下列各项中，（）适用于市场预测呈水平波动，无明显上升或下降趋势情况下的预测。
A. 高次指数平滑法
B. 趋势外推法
C. 一次指数平滑法
D. 弹性系数法
The author mentions twenty percent itl line 23 to indicate that（）
A. eagles are twenty percent bigger than most birds
B. twenty percent of all nests include foundation branches
C. the nests of eagles are twenty percent of larger than those of other birds
D. birds Can carry twenty percent of their own weight
The word "strain" in line 23 is closest in meaning to（）
A. struggle
B. strength
C. strategy
D. stress
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 all example of the buildup of plankton sediment
D. indicate the largest single plankton buildup on Earth
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