2. 外语
  3. ______ air and marine transportation has greatly expanded but is under stricter international regulation? ______ illegal immigr

______ air and marine transportation has greatly expanded but is under stricter international regulation? ______ illegal immigr

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问题 ______ air and marine transportation has greatly expanded but is under stricter international regulation?
______ illegal immigration into subarctic areas becomes a major problem?
选项 A、 
B、 
C、 
D、 
答案C
解析
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