A:2.52g
B:4.44g
C:10.5g
D:12.32g
— Has Tom finished his homework?
— Sorry, I don't know. He ________ it this morning when I saw him.
我国海洋总污染量的80%来自____ ,主要是____ 和生活污水.
①主动寻求家长、老师的帮助 ②不顾一切,与不良青年搏斗到底
③向有关部门举报,维护合法权益 ④忍气吞声,交出财物,息事宁人
下列叙述中,不正确的是( )