50. (1) No wonder our feet get tired!
(2) Most people walk over 100,000 miles in a lifetime.
(3) The shoes we wear cause some of these problems.
(4) Your feet take a lot of wear and tear.
(5) Four out of five Americans have foot problems, some doctors say.
(6) That’s like walking four times around the earth.
(A)45123 (B) 431256 (C) 456312 (D) 426153
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