13. Most of us, if we know even a little about where our food comes from, understand that every bite put into our mouths was alive.
句意：如果我们 了解一点食物来自于哪里，我们大多数人就明白，放在我们的口里的每一点食物在之前都是活着的。A. steadily意为稳定地， B. instantly意为立即地，C. formerly意为先前地， D. permanently意为永久地。故选C。
理解句子意思并且选出合适的副词。
副词词义