31. According to the passage, people in industrialized nations would be much healthier if they ate____________________.

A. more food than humans living 10,000 years ago did.

B. as much food as humans living 10,000 years ago did

C. more kinds of food eaten by people living over 10,000 years ago.

D. more of the same kind of food eaten by people over 10,000 years ago.

32. New kinds of sicknesses have been found because ___________________.

A. the human body has changed compared with humans who first appeared on the earth.

B. the way we live has changed a little.

C. our body can’t deal with the changes in life style.

D. the way we live today is proper for the human body.