2014年6月CET-4冲刺试题及答案(第三套)_第3页

　　(25 minutes)

　　■ Section A

　　Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once.

　　Questions 11 to 20 are based on the following passage.

　　Landslides are a form of mass movement, a term used to describe any sort of gravity-induced movement of sediment down a slope. Mass movements can 11 slowly over a period of years, or they can happen in a matter of minutes. A mass movement can be as small as some rocks and debris you kick down a small 12 or as big as the 1980 landslide set off by the eruption of Mount St. Helens.

　　There are many different kinds of mass movements 13 by the type of material involved, the way it is moved and how fast it moves. However, with any mass movement, a soil layer is separated to some 14 from the underlying bedrock. Soil is the 15 loose mixture of worn-down rock, minerals, air, water and decayed organic matter that covers the ground. Bedrock is the more 16 , solid layer of rock underneath.

　　Although the word landslide is often used (incorrectly) to encompass many types of mass movements, a landslide is actually something more 17 . A slide refers to a mass movement where rocks and sediment are loosened from the stable, underlying bedrock along a distinct 18 of weakness. The rocks and sediment separate and move down the slope rapidly. You could think of it as a poster fastened to a wall with tape. The poster will remain on the wall without any outside force 19 on it. But if extra weight is attached to the poster, or if the tape is moistened, the 20 will be weakened and the poster will fall.

　　A) stable I) zone

　　B) occur J) degree

　　C) risky K) specific

　　D) backing L) categorized

　　E) relatively M) room

　　F) connection N) slope

　　G) positively O) acting

　　H) grouped