A:Sure, but I have to visit my grandpa.
B:Not at all. I’ll be glad to.
C:I really can’t agree with you; I prefer science.
D:I’m sorry, but I have to help my sister with her English.
100年来,果蝇作为经典模式生物在遗传学研究中备受重视。请根据以下信息回答问题:
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