答案：C

题目分析：考查从句，从句fewer teenagers are now studying foreign languages.不缺少成份，动词show，that引导的宾语从句，所以选C

点评：从句是高中阶段重点，又是难点，是高考常考内容之一，本题有动词show，就很容易做出选择了，要求考生熟记连词的用法

即学即练：You are saying that everyone is equal, _____ is _____ I disagree.

A. that; what       B. which; what      C.which; where        D.that; where

选C