语法与词汇 1.Nearly all the doctors______upon a diet which contains a lot of fat and few vegetables.

【正确答案】 C

【答案解析】动词形异义近辨析。frown on／upon意为“(以皱眉蹙额)表示不满、厌恶，不赞成等”，如：My wife frowns on my smoking．妻子不赞成我抽烟。