請依下文回答第 46 題至第 50 題。
       The Mla Bri are a small group of nomadic hunter-gatherers (about 400) living in northern Thailand who since the1990s have begun to settle in semi-permanent villages. The Mla Bri are well-known to anthropologists because, untilrecently, they engaged extensively in foraging, gathering, and hunting as the primary means of subsistence, making theman outlier in a region traditionally dominated by people tied to rice cultivation. Indeed, they were not tied to theagricultural cycle, although they did occasionally hire themselves out as laborers to agricultural people. As nomads, theytypically shifted campsites every few weeks. However, between 2005 and 2008, there were five fatal suicides in thisgroup, including four males and one female. This is apparently a new phenomenon； suicide was virtually unknown amongthe Mla Bri before more permanent settlements were established.        From 1980 to 2010, many changes occurred in the world of the Mla Bri, bringing both new opportunities and theformidable challenge of settling into permanent dwellings with all that that entails. Traditionally, so far as we canascertain, there has been very little intra-group violence among the Mla Bri, though they were often subject to attacksfrom outsiders. But, in recent years, as alcohol use/abuse has become more common, so has violence. Examples are menfighting physically when they are drunk, physical abuse of wives by drunk husbands, and wives fighting back. Prior to1993, there were no permanent Mla Bri settlements, and 2001 was an important year for them because not only were thefirst settlements legally established, but they were also granted Thai citizenship which gave them identity cards and readyaccess to health care, schooling, and other modern government services.        Ultimately, the most general explanation for the emergence of suicide among the Mla Bri is a classic one found inmany societies. The rapid social change of the last thirty years has been deeply disorienting for the Mla Bri, as theystopped living in the remote forest, and took up the modern life of permanent housing, schooling, medical care, electricity,television, and other accoutrements. Such kind of “civilization” contributed to material well-being and a healthierlifestyle, but at the same time led to a breakdown in the system of social norms. As with many other groups, the effectsof this are probably elevated rates of alcoholism, marital dissolution, and the suicide problems.
【題組】46 Which of the following is the most appropriate title for this passage?
(A) Social Progress in Mla Bri of Northern Thailand.
(B) Suicide among the Mla Bri of Northern Thailand.
(C) Modernization of the Mla Bri in Northern Thailand.
(D) Domestic Violence in the Mla Bri of Northern Thailand.