判断机体肥胖最常用、最简便的指标是()。
A.理想体重
B.BMI
C.皮褶厚度
D.体脂含量
E.瘦体重
参考答案:B
Country life gives him peace and quiet, which is ________ he can't enjoy while living in big cities.
A.that
B.why
C.where
D.what
比较国民生产总值与人均国民生产总值。