19世纪70年代，作为新能源进入生产领域的是（ ）
A：蒸汽
B：煤炭
C：电力
D：水力
下列关于计算机网络的说法正确的是（ ）
cook, on, do, live, busy, read, play, about, clean, weekend
Hello! My name is Zhang Ming. I ____ in Qingdao. I am a student. Do you want to know about my ____? I'm very happy ____the weekend. I can ____many things(事情). Usually I do my homework and ____books. Sometimes I ____the rooms and ____dinner with my mum. I often watch TV and ____ pingpong with my father. I'm ____at home. This is my weekend. What ____your weekend?
食物在霉变过程中产生的____含有对人体有害的物质，所以发霉变质的食物是绝对____食用的。
