By the time I finished high school, my interest in animals had grown, and enrolled at a university to study biology.l learned soon enough that studying animals __56__ this level was not in the animals best __57__ .I remember one midterm exam in __58__ each student was handed a large, freshly-killed frog and __59__ to dissect (解剖) and mark a set of body parts.I looked at the __60__ frog in front of me and was saddened that her life was __61__ away for such a slight __62__ .A year later, in the same lab __63__ dissected the frog, I performed a small act of animal____. We were__65__ on fruit flies, and it was time to record the distribution of characteristics in their next generation. Flies were __66__ in small plastic bottles. Counting the number of flies with white or red eyes required first exposing them to ether (乙醚 )__67__ they could not move. The flies were then spread onto a piece of white paper __68__ and counted. When the data collection was __69__ ,the flies had no further use, and our instructions were to __70__ them into a small glass dish of oil at the center of each desk, which was to be their final resting __71__ .Once may little pile of flies had been counted, I pushed them off the edge of the paper. As we recorded our data, I kept one eye __72__ them.Within minutes the pile was humming (嗡嗡叫 )as tiny legs and wings beat their way out of the ether fog. I was extremely excited as they __73__ flight. That was my first __74__ in refusing to conduct scientific research that treated nonhuman life in a(n) __75__ way.68. 68 A being examined B to be examined C being operated D to be operated