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Literary works often contain some physical knowledge. Bold characters in the following poems indicate displacement () A. Flying down three thousands of feet, which is suspected to be silver.

A, a straight drop of 3,000 feet, is the straight-line distance from the point of starting to fall to the point of falling, which is the displacement, so A is correct;

B, single-handedly fighting a thousand miles, refers to a trajectory, not a distance, and B is wrong;

C, sitting on the ground, walking 80 thousand miles a day is this distance, so C is wrong;

D, 8 thousand Li refers to the length of the trajectory, so D is wrong.

So choose: a.

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