A. His, Arg, Glu
B. His, Ser, Asp
C. Arg, Ser, Asp
D. Asp, Glu, Ser
The passage infers that American women like
A.a "help yourself" approach
B.waiting to be served
C.a slow service
D.cream and sugar
Sales of organic food have fallen because of______.
A.high price
B.economic decline
C.bad service
D.poor quality
A computer virus ______.
A.is the same as a biological virus
B.is also an organism
C.is a series of electronic commands
D.is one of biological viruses