Scientists who have studied the New Madrid fault say there have been numerous smaller quakes in the area since 1811; these smaller quakes indicate that larger ones are probably coming, but the scientists say have no method of predicting when a large earthquake will occur.

　　11. This passage is mainly about .

　　A) the New Madrid fault in Missouri

　　B) the San Andreas and the New Madrid faults

　　C) the causes of faults

　　D) current scientific knowledge about faults

　　12. The New Madrid fault is .

　　A) a horizontal fault

　　B) a vertical fault

　　C) a more serious fault than the San Andreas fault

　　D) responsible for forming the Mississippi River

　　13. We may conclude from the passage that .

　　A) it is probably as dangerous to live in Missouri as in California

　　B) the New Madrid fault will eventually develop a mountain range in Missouri

　　C) California will become an island in future

　　D) A big earthquake will occur to California soon

　　14. This passage implies that .

　　A) horizontal faults are more dangerous than vertical faults.

　　B) Vertical faults are more dangerous than horizontal faults

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