【題目】 ______ the average age of the population increases, there are more and more old people to care for.

A. Unless B. Until

C. As D. While

【答案】C

【解析】試題分析：句意：隨著人口平均年齡的增長，越來越多的老人要照顧。Unless除非；until直到；as因?yàn)�，正如，隨著；while雖然，然而，當(dāng)……時(shí)候。根據(jù)語境，故選C。

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