答案:D
以原发性DNA损伤为检测终点的致突变试验是()
A.UDS试验
B.Ames试验
C.基因正向突变试验
D.微核试验
E.染色体畸变试验
—How was your summer holiday, Peter?
—We had ____ in Beijing.[ ]
A. quite a good time
B. a quite good time
C. very a good time
D. very good time