题目

夏天，煮沸过的肉汤很快就会腐烂变质，主要原因是（ ） A、蛋白质被破坏 B、细菌大量繁殖 C、肉汤中水分过多 D、空气使肉氧化分解 答案：B 解析: 有机物腐烂的实质是指细菌等微生物大量繁殖导致有机物被分解的过程。根据语境，从方框中选择恰当的短语填空half an hour, lots of, get to, take a walk, do one’s homework【1】Now _________ people are in the park.【2】—How can I _________the zoo?—Sorry, I don’t know.【3】My mother likes _________after dinner.【4】I usually do sports for _________ in the morning.【5】I _________ at home at night.