________ the field of physics, the Chinese over there is one of the top experts.
________ the field of physics, the Chinese over there is one of the top experts.
A.In
B.On
C.At
D.Of
答案及解析： A
________ the field of physics, the Chinese over there is one of the top experts.
A.In
B.On
C.At
D.Of
答案及解析： A