回 )内に入れるのに最も適切なものを下のアーカから選び, マークしなさい
(Q①) agroup of things or parts that work togetheri ( )
(⑫ atime when you can do somethingi( )
(⑬ atime when something very dangerous or serious happens: ( )
(⑭ the thngs that are happening in a certain place at acertain timei( 国 )
(⑯) aperiod of ten yearsi( )
(6) all the gases around the earth:( )
ア atmosphere イ chanee
オ sibuation カ system
ウ crisis エ decade
