She asked me which one I'd like, and I said I didn't mind.
她问我要哪一个,我说哪一个都没有关系。[动词时态一致,这是中国人学习英语最头痛的一个问题。]
Later it was found that there was a type of mosquito which acted as the carrier of this disease and passed it on to the rabbits.
后来又发现,有一种蚊子是传播这种疾病的媒介,能把此病传染给兔子。