[单项选择]Most of us can’t remember our first vaccination, a common practice of preventing us against diseases. Chances are, it was a shot filled with a drug formula—just enough to produce a mild infection but not the full-blown disease. Immunizing, or preventing people against some diseases in this way has worked reasonably well for more than a century, but scientists think they can do better by using genetically engineered plants.
We all know that eating fruits and vegetables is good for us, but within the next decade we could be eating as a way to deliver drugs that keeps off epidemic diseases or that treat various chronic conditions. "The idea of vaccinating people with edible plants is very new," says Dwayne Kirk of the Boyce Thompson Institute for Plant Research in Ithaca, New York, "But it’s a lot friendlier than injections."
Potatoes and tomatoes seem for now to be the most efficient vehicles for the new approach. Instead of mixing viral or bacterial DNA in a formula for in
A. These plants taste better than drugs.
B. These plants are more effective that drugs.
C. It is convenient to obtain these plants.
D. People there believe in the curative power of these plants.

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