导致肥胖的不良饮食行为包括以下哪些？
A、吃过多细粮
B、重油重盐
C、进食速度快
D、喜食甜食

单项选择题A boy always feels tired. Blood test shows that he is not iron deficient, but his MCV（平均红细胞体积）is very low. The name of this condition derives from the Greek Thalassa sea. What may be the possible diagnosis of him?

单项选择题在不考虑其他因素影响的情况下，海拔高度越高的地方，其大气透明系数越大，到达地面的太阳总辐射量就越大。 A、正确 B、错误