用鱼缸饲养金鱼时,如果金鱼的数量过多,就会出现金鱼频频浮头的现象,甚至会导致死亡,是因为_______不足。
氧气
A.柔韧性较好
B.导热性较好
C.导电性较好
D.价格便宜
I was just talking to Margot when Jackson _______..
A.broke in
B.cut out
C.broke out
D.cut up