2012年大学英语六级考试考前预测卷（第一套）_第5页

PassageTwo
29. A) They were made only three times inEarth's history.
B) The most beautiful diamond comes from Africa.
C) They are even harder than those sawblades.
D) The hardness of diamonds depends on the purity.
30. A) The cutting of diamonds needs to have some changes.
B) The environment of making diamonds haschanged.
C) The composition of rocks is the same asit used to.
D) The demand for diamonds has increasedrecently.
31. A) 3.3 billion years ago.
B) 2.9 billion years ago.
C) 1.2 billion years ago.
D) 2.1 billion years ago.
Passage Three
32. A) They were the most terrible disasteron earth.
B) They were warning signs of some bigevents.
C) They were turnovers of the big dragons.
D) They were punishment from an angry god.
33. A) The surface of the earth is made upby 12 huge plates.
B) The surface is the most important partof the earth.
C) We can now tell where and whenearthquakes will happen.
D) Our earth is made up by some oceans andlands.
34. A) It will have more earthquakes.
B) It is becoming larger slowly.
C) It is divided by a large plate.
D) It will become even deeper.
35. A) It is the meeting point of thePacific and the North American Plates.
B) It runs a length of roughly 1906kilometers through Califomia.
C) It is one of the longest and most activefaults in the world.
D) It once caused the largest earthquake inthe world.