设Z是整数集,+是整数加法运算,则是群,对任一整数i,其逆元是() .
We ought to organise more ________________ events.
A. society
B. social
C. socially
D. societies
Cosplay fans often get together regularly to play.
A. 动漫迷们一般会定期举行聚会。
B. 动漫迷们经常聚在一起玩儿。
C. 动漫迷们总会定期参加聚会。
D. 动漫迷们非常喜欢聚会。
Cars have become a(n) _______________ part of our lives.
A. dispensable
B. indispensable
C. indispensability
D. dispensability