Linda,I have to go shopping now.Please your little sister at home.
A:look for
B:look like
C:look after
D:look up
医院重症监护室内配有充满氧气的钢瓶,供病人急救时使用,其密度为5kg/m3。若某次抢救病人时用去瓶内氧气的一半,则瓶内剩余的氧气的密度为____ kg/m3.
The interesting stories made everyone _______.