At what magnitude of earthquake do bridges collapse?

d. therefore pilots wisely train these cubs by various strategic tricks to look danger in the face a little more calmly.

c or d they are the same

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mark twain, real name samuel langhorne clemens, was an american writer, humorist, entrepreneur, publisher, and lecturer. among his novels are the adventures of tom sawyer and its sequel, the adventures of huckleberry finn, the latter often called "the great american novel". wikipedia