根据短文内容，选择最佳答案。

Schedule a Tour

    University of South Carolina （USC) is famous for its warm southern hospitality（好客）. Schedule a visit and feel it in person. Our walking tours are led by current students, called University Ambassadors, who are looking forward to telling you what it's like to live and study in USC. Our walking tours run Monday through Friday and most are around 2 hours. The university will be closed on Tuesday, July 4, 2017 in observance of the holiday. We welcome your visit year round and will be ready for you, rain or shine. Please refer to the list below to determine which tour is best for you and remember to book at least two weeks in advance.

复数i²⁰¹⁵（i为虚数单位）的共轭复数是（　　）

中东是世界上冲突不断的热点地区，产生冲突的主要原因是(     )
①地理位置重要  ②石油资源丰富  ③水资源贫乏  ④宗教矛盾尖锐

刚出壳的蚁蚕很弱小，不能____。