A baby might show fear to an unfamiliar adult,______ he is likely to smile and reach out to another infant.

单项选择题If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either______ or abandoned.

单项选择题When doing business in the Arab world, do not be surprised if your meeting is interrupted several times by people who come into the room ______, whisper, or speak softly to the person with whom you are talking, and leave.