单选题 It can be concluded that_______.

A、 raising the world' s temperature only a few degrees would not do much harm to life on earth
B、 lowering the world' s temperature merely a few degrees would lead many major farming areas to disaster
C、 almost no temperature variations have occurred over the past decade
D、 the world's temperature will remain constant in the years to come

【正确答案】 B

【答案解析】[解析]根据第二段第二句话“A drop of just a few degrees．．．”可推知。