Even if families don’t sit down to eat together as frequently as before, millions of Britons will nonetheless have got a share this weekend of one of that nation’s great traditions: the Sunday roast. (1)_____ a cold winter’s day, few culinary pleasures can (2)_____  it. Yet as we report now, the food police are determined that this (3)_____ should be rendered yet another guilty pleasure (4)_____ to damage our health.

    The Food Standards Authority (FSA) has (5)_____ a public warning about the risks of a compound called acrylamide that forms in some foods cooked (6)_____ high temperatures. This means that people should (7)_____ crisping their roast potatoes, reject thin-crust pizzas and only (8)_____ toast their bread. But where is the evidence to support such alarmist advice? (9)_____ studies have shown that acrylamide can cause neurological damage in mice, there is no (10)_____ evidence that it causes cancer in humans.

    Scientists say the compound is (11)_____ to cause cancer but have no hard scientific proof. (12)_____ the precautionary principle, it could be argued that it is (13)_____ to follow the FSA advice. (14)_____, it was rumoured that smoking caused cancer for years before the evidence was found to prove a (15)_____.

    Doubtless a piece of boiled beef can always be  (16)_____ up on Sunday alongside some steamed vegetables, without the Yorkshire pudding and no wine. But would life be worth living? (17)_____, the FSA says it is not telling people to cut out roast foods (18)_____, but to reduce their lifetime intake. However, its (19)_____ risks coming across as being pushy and overprotective. Constant health scares just (20)_____ with no one listening.

答案精析：介词辨析题。原文第一句提到，尽管英国人不再像之前那样频繁地聚会，但很多人仍然会在周日吃烧烤，这是这个国家的传统。空格所在句中， ____ a cold winter’s day后面提到了culinary pleasures（烹饪的乐趣），可见该句是对前面提到的周日烧烤进行相关说明，通过描绘在一个寒冷的冬日烧烤的场景，来体现这是一件多么惬意的事。此处考查的是“在……的一天”的表达方式，应填入介词on，如果时间前有形容词修饰，表示在“具体的某一天”，填入空格在此处表示“在一个寒冷的冬日”。

错项排除：表示时间时，in后面通常是加一段时间如年、季、月等，或者是一天中的早上、下午或晚上，一般不与具体某一天连用，故排除A项。把B、D两个选项代入空格处意思分别是“朝着一个寒冷的冬日”和“直到一个寒冷的冬日”，都存在语义不通的问题，故排除。