【单选题】—What's behind the door? —There must be a dog _____ behind it. [ ]
【单选题】It's bad to sit in front of the computer the whole night.
【判断题】Don't sit like that it's bad for your back.
【简答题】广告行政管理的主要依据是 。 A法律 B法规 C相关政策
【简答题】It’s bad to sit in front of the computer the whole night.
【单选题】--Nancy's grades are really bad. --Yes, but Tom's are ______.