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() .
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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
In fact, many senior high school students view the proms () classes before heading off to college.
A. with
B. and
C. for
D. as