Everyone has heard of the San Andreas fault (断层), which constantly threatens California and the West Coast with earthquakes. But how many people know about the equally serious New Madrid fault in Missouri?
Between December of 1811 and February of 1812, three major earthquakes occurred, all centered around the town of New Madrid, Missouri, on the Mississippi River. Property damage was severe. Buildings in the area were almost destroyed.
Whole forests fell at once, and huge cracks opened in the ground, allowing smell of sulfur (硫磺) to filter upward.
The Mississippi River itself completely changed character, developing sudden rapids and whirlpools. Several times it changed its course, and once, according to some observers, it actually appeared to run backwards. Few people were killed in the New Madrid earthquakes, probably simply because few people lived in the area in 1811; but the severity of the earthquakes are shown by the fact that the shock waves rang bells in church towers in Charleston, South Carolina, on the coast. Buildings shook in New York City, and clocks were stopped in Washington, D.C.
Scientists now know that America's two major faults are essentially different. The San Andreas is a horizontal boundary between two major land masses that are slowly moving in opposite directions. California earthquakes result when the movement of these two masses suddenly lurches (倾斜) forward.
The New Madrid fault, on the other hand, is a vertical fault; a some point, possibly hundreds of millions of years ago, rock was pushed up toward the surface, probably by volcanoes under the surface. Suddenly, the volcanoes cooled and the rock collapsed, leaving huge cracks. Even now, the rock continues to settle downwards, and sudden sinking motions trigger (触发) earthquakes in the region. The fault itself, a large crack in this layer of rock, with dozens of other cracks that split off from it, extends from northeast Arkansas through Missouri and into southern lllinois.
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.
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
第1题
在下面的叙述中,哪一个是不正确的?
A.在DOS中,启动进程的机制是EXEC函数
B.在Windows中,启动进程的函数是CreateProcess
C.在OS/2中,启动进程的函数是CreateProcess
D.在DOS中,启动进程的函数也是CreateProcess
第2题
A.在DOS中,启动进程的机制是EXEC函数
B.在Windows中,启动进程的函数是CreateProeess
C. 在OS/2中,启动进程的函数是CreateProcess
D.在DOS中,启动进程的函数也是CreateProcess
第3题
下面关于启动进程机制的叙述中,错误的是()。
A)在DOS中是EXEC函数
B)在Windows中是CreateProcess函数
C)在OS/2中是CreateProcess函数
D)在DOS中是CreateProcess函数
第4题
(9)操作系统必须提供一种启动进程的机制,在DOS中,该机制就是EXEC函数。在Windows和OS/2中启动进程的函数是 ___________。
第5题
下面关于启动进程机制的叙述中,错误的是______。
A.在DOS中是EXEC函数
B.在Windows中是CreateProcess函数
C.在OS/2中是CreateProcess函数
D.在DOS中是CreateProcess函数
第6题
A.在DOS中,该机制是EXEC函数
B.在Windows中启动进程的函数是CreateProcess
C.在OS/2中启动进程的函数是CreateProcess
D.在DOS中启动进程的函数也是CreateProcess
第7题
A.在dos中,该机制是exec函数
B.在windows中启动进程的函数是createprocess
C.在os / 2中启动进程的函数是createprocess
D.在dos中启动进程的函数也是createprocess
第8题
(24)下面关于启动进程机制的叙述中,错误的是()。
A)在DOS中是EXEC函数
B)在Windows中是CreateProcess函数
C)在OS/2中是CreateProcess函数
D)在DOS中是CreateProcess函数
第9题
A.在DOS中,该机制是EXEC函数
B.在Windows中启动进程的函数是CreateProcess
C.在OS/2中启动进程的函数是CreateProcess
D.在DOS中启动进程的函数也是CreateProcess
第10题
A.在DOS中,该机制是EXEC函数
B.在Windows中启动进程的函数是CreateProcess
C.在OS/2中启动进程的函数是CreateProeess
D.在DOS中启动进程的函数是CreateProcess
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