[简答题]By the time I finished high school, my interest in animals had grown, and enrolled at a university to study biology. I 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 I dissected the frog, I performed a small act of animal _64. 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
A. A．at
B．with
C．for
D．off

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[单项选择]By the time I finished high school, my interest in animals had grown, and enrolled at a university to study biology. I 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, fleshly-killed frog and (59) to dissect (解剖) and mark a set of body parts. I looked at the (60) flog 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) I dissected the flog, I performed a small act of animal (64) . 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 instr
A. at
B. with
C. for
D. off

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