【判断题】氟利昂气体与燃烧火焰经过反应会产生对人体危害大的有毒光气
【判断题】高效利尿药的主要作用部位是髓袢降支粗段。
【单选题】—It's time to go to bed, Li Ping. —Mum, I have a lot of homework to do, I won't go to bed ________ I finish it. [ ]
【判断题】如下语句是否是命题: 北京是中华人民共和国的首都
【单选题】It's time for Meimei and _____ to the Palace Museum. [ ]