"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
讲解答案：
B 根据第一段第二句：The reason is obvious：the graying of America means jobs.(原因很明显：美国的老龄化提供了许多工作岗位。以及第三段最后：Any student who combines an expert knowledge in gerontology with,say, an MBA or law degree will have a license to print money.(任何一个有老年学专业知识的学生再加上工商管理学硕士或法学学位，就有了印钞票的执照。)可见学习老年学的就业优势，所以这句话的意思是“老年学突然火起来”。故B项是正确的。
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