（） were originally called Yankees, which came to stand for all Americans.

A. Being a fake veganist.
B. Enjoying a cold dish of turkey meat from time to time.
C. Changing into a veganist immediately.
D. Holding a quick ceremony before becoming a veganist.

A. There is yet no scientific consensus on the questions about "probiotic" products.< br>B. Antibiotics are not very selective as to which bacteria they attack.< br>C. It is impossible to know how many live bacteria will be preserved in the digestive system.< br>D. It is not always easy to measure to what extent probiotic products can outrun potentially unfriendly microbes.