单选题 Mothers tend to be too______towards their children. They should let them see more of the world.
【正确答案】 B
【答案解析】解析：形容词词义辨析。从后半句语境可以判断，妈妈们很少让孩子们与外界接触，而这种行为多是出于保护，故protective符合语境。故答案为B。