—Jenny, would you like to go hiking with me on Sunday or Saturday?
—_______ day is OK. I am free all this weekend anyway.
A:Either
B:Neither
C:Both
D:All
据中国地震台网测定,北京时间2008年5月12日14时28分,四川省汶川县发生8.0级地震。联系所学知识回答:
此次地震发生的原因是( )