单选题 Many Europeans ______ the Continent of Africa in the 19th century.
【正确答案】 A
【答案解析】解析：explore vt.探险，勘探：探索，探究。probe v.探索，探查，探测(句型：probe sth．；probe for sth．；probe into sth．)。search(for)vt．搜，寻找，探查。tour v.旅行，游历。