1.C)New explanations for the obesity epidemic

　　2. A)gained the least weight

　　3. B)it causes sleep loss

　　4. D)it contributes to our weight gain

　　5. C)it suppresses their appetite

　　6. D)those who quit smoking

　　7. B)the rising proportion of minorities in its population

　　8.not entirely clear

　　9.family size

　　10 party genetiz