【单选题】如果一个样本因人为故意操纵而出现偏差,这种误差属于()。
【单选题】—Please _______ the photos to your mother. —OK.
【单选题】Cash in China is _____ unnecessary
【单选题】如果一个样本因人为故意操纵而出现偏差,这种误差属于( )
【判断题】Cash in China is increasingly unnecessary.
【单选题】Cash in China is _____ unnecessary
【判断题】In English for Hotel, using "certainly" is better than "OK".