22. What is the author’s main concern? (A)) How to render automobiles pollution-free. (B)) How to make smaller and safer automobiles. (C)) How to solve the problem of traffic jams. (D)) How to develop an automated subway system.

31. “... Old is suddenly in” (Line 1, Para. 1) most probably means “________”. (A)) America has suddenly become a nation of old people (B)) gerontology has suddenly become popular (C)) more elderly professors are found on American campuses (D)) American colleges have realized the need of enrolling older students

22. What is the author’s main concern?
(A)) How to render automobiles pollution-free.
(B)) How to make smaller and safer automobiles.
(C)) How to solve the problem of traffic jams.
(D)) How to develop an automated subway system.

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