18. In order to control the deer population, a biologist has proposed injecting female deer during breeding season with 10 milligrams of a hormone that would suppress fertility. Critics have charged that the proposal poses health risks to people who might eat the meat of treated deer and thereby ingest unsafe quantities of the hormone. The biologist has responded to these critics by pointing out that humans can ingest up to 10 milligrams of the hormone a day without any adverse effects, and since no one would eat even one entire deer a day, the treatment would be safe.
The biologist’s response to critics of the proposal is based on which one of the following assumptions?
(A) People would be notified of the time when deer in their area were to be treated with the hormone.
(B) The hormone that would be injected into the deer is chemically similar to hormones used in human contraceptives.
(C) Hunting season for deer could be scheduled so that it would not coincide with breeding season.
(D) The hormone in question does not occur naturally in the female deer that would be injected.（D）
(E) Most people do not consider deer meat to be part of their daily diet and eat it only on rare occasions.
so strange~~~I always think that choice E is the correct one.I don't know why D is best.
D我觉得是无关啊
The biologist assumed that injection was the only source of hormone.
got it~~thank you very much!!
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