A. None, one or two working copies of UGT2B17 can be found in different peopl
B. Test results would depend on numbers of working copies of UGT2B17.
C. Most Caucasians have no functional copies of UGT2B17.
D. Most Asians have no functional copies of UGT2B17.

A. Because it is required by the Beijing Olympic Games Committe
B. Because it may defend them against unfavorable testosterone test result
C. Because it is one of the ways to show "spirit of Olympianism".
D. Because it will help them to perform better in the Olympic Game
A. To show that people don't ask for much about their dream jo
B. To show that most people in America are satisfied with their job
C. To offer supporting evidence to the preceding paragrap
D. To provide a contrast to the preceding paragraph