33. (A) those (B) it (C) that (D) which

41. Which of the following best states the main idea of the passage? (A) Walking is the most intense and effective form of exercise for all people. (B) Walking is a practical health habit because it is easy to begin and continue. (C) Walking should be chosen only by people who do not have enough time for sports. (D) Walking is useful mainly because it requires professional instruction and planning.

33.
(A) those
(B) it
(C) that
(D) which

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