参考答案：B

解析：[听力原文] Governments from Singapore to South Korea are increasingly lifting restrictions on gambling. But gamblers do not have to wait for new casinos to open to place their bets: They can just use their mobile phones. Telecommunications analysts predict that Asia will catch up soon. British Informa, a telecom and media consulting company, forecasts that close to 100 million people in the Asia-Pacific region will use mobile phones to place bets in 2010, half of the users globally. The mobile gambling market in Asia is still limited by the lack of suitable phones. Another obstacle for gaming operators is the unclear legal situation in many places.

[分析]： 因果关系的找寻和判断。 题干问亚洲移动电话赌博市场受到限制的主要原因。根据原文The mobile gambling market in Asia is still limited by the lack of suitable phones 即在亚洲，因合适的手机匮乏，移动赌博市场有限，由此可判断B的说法“技术限制”与原文相符；虽然文中也提到另外一个原因Another obstacle for gaming operators is the unclear legal situation in many places即赌博的另一障碍是不少地方法规情况不明了，但没有选项与之相符，因此该题正确答案为B。[解题关键] 根据表示因果关系的信号词来判断相关信息的因果关系。本题中原文使用 by短语表示前后文的因果关系。