单选题 He ______people with less knowledge than he has.
[A] looks up [B] looks down upon
[C] looks at [D] look after

【正确答案】 B
【答案解析】[解析] 本题考查动词词组辨析。look up向上看；look at看…；look down upon看不起、歧视；look after照看、照顾。句意：他瞧不起那些不如自己博学的人。所以只有选项B符合题意。