题目

If it really is what’s on the inside that counts, then a lot of thin people might be in trouble. Some doctors now think that the internal(内部的) fat surrounding important organs like the heart or liver could be as dangerous as the external fat which can be noticed more easily. “Being thin doesn’t surely mean you are not fat,” said Dr Jimmy Bell at Imperial College. Since 1994, Bell and his team have scanned nearly 800 people with MRI machines to create “fat maps” showing where people store fat. According to the result, people who keep their weight through diet rather th在地球仪上，经度30°、纬度30°的地方一共（　　）A．一个B．二个C．三个D．四个