A.is an issue that appeared only recently.
B.has decreased dramatically since the l970s.
C.originated from ancient Greece.
D.has been completely controlled by WADA.



A.is always accurate and reliable.
B.is proved to be inaccurate.
C.may sometimes show inaccuracy.
D.has helped end doping in sport.
A.1:1.
B.2.5:1.
C.3.3:1.
D.4.5:1.
A.None,one or two working copies of UGT28 17 call be found in different people.
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.