【題目】2001年11月，太平洋上美麗的島國﹣﹣圖瓦盧領(lǐng)導(dǎo)人在一份聲明中說，．他們對抗海平面上升的努力已告失敗，并宣布他們將放棄自己的家園，舉國移民新西蘭．圖瓦盧成為全球第一個“環(huán)境難民”國家的主要原因是（　�。�
A.近年來全球降水增多
B.二氧化碳排放增多使全球變暖
C.人為地破壞海洋環(huán)境
D.圖瓦盧人口增長迅速

【答案】B
【解析】全球變暖是由多種原因造成的，其中人類活動排放的溫室氣體過多造成大氣的保溫功能增強是一個不可忽視的原因． 圖瓦盧成為全球第一個“環(huán)境難民”國家的主要原因是二氧化碳排放增多使地球不斷變暖，兩極的冰川融化，海平面上升造成．故選項B符合題意．故選：B．

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