进行各期临床试验、人体生物利用度或生物等效性试验时必须遵守的规定是（）
A．GLP
B．GCP
C．GMP
D．GSP
E．GAP
参考答案：B
— Where are the twins?
— I think they _____ Hangzhou. They _____ there twice before. [ ]
A. have been to; has gone to
B. have gone to; have been
C. have been to; have been to
D. have gone to; have gone
大气的易变成分包括：（）
A.CO2
B.O3
C.AB都对
D.AB都错
