OG13第16篇78题有疑问

粉色炊烟

In later studies we found that injecting insulin into a rat’s bloodstream also caused parallel elevations in blood and brain tryptophan levels(20) and in serotonin levels. We then decided to see whether the secretion of the animal’s own insulin similarly affected serotonin production. We gave the rats a carbohydrate- containing meal that we knew would elicit insulin secretion. As we had hypothesized, the blood tryptophan (25) level and the concentrations of tryptophan serotonin in the brain increased after the meal.


　4. According to the passage, one reason that the authors gave rats carbohydrates was to

　　(A) depress the rats’ tryptophan levels

　　(B) prevent the rats from contracting diseases

　　(C) cause the rats to produce insulin

　　(D) demonstrate that insulin is the most important substance secreted by the body

　　(E) compare the effect of carbohydrates with the effect of proteins
答案选C。可是我定位到文中不是说carbohydrate would elicit insulin secretion.是胰岛素分泌物啊，但是C说的是产生胰岛素啊！
求解释~~~~~~~~~~~~

yyb3well

举个例子：increase car production
原文：elicit insulin secretion
懂了吧?