题目
着县着县What does the word “snowball” in Paragraph three most probably mean.着县第一次着县Why do smokers tend to weigh less than nonsmokers and gain weight when they give up the habit?着县Contrary to “common knowledge”, nonsmokers do not generally eat more than smokers, nor do they exercise less, studies find. Research performed on smokers at rest indicates that nicotine (尼古丁) itself can increase basal metabolic (新陈代谢的) rates, meaning smokers burn more energy than nonsmokers during periods of inactivity. But surveys suggest most smokers smoke not while completely at rest, but while performing light activities such as desk work that can increase metabolic rates by two or three times. Unless nicotine’s metabolic effects increase proportionally with metabolic rates, its influence on weight might be insignificant.着县Now a study shows that nicotine’s effects on body-fuel consumption indeed increase proportionally with increases in activity. “These results indicate that the metabolic effect of nicotine may play a greater part in accounting for body-weight differences between smokers and nonsmokers than was previously believed,” says Kenneth A. Perkins and his colleagues at the University of Pittsburgh School of Medicine.着县A) throw atB) a ball made of snow着县着县C) grow rapidly √D) melt easily
着县着县What does the word “snowball” in Paragraph three most probably mean.着县第一次着县Why do smokers tend to weigh less than nonsmokers and gain weight when they give up the habit?着县Contrary to “common knowledge”, nonsmokers do not generally eat more than smokers, nor do they exercise less, studies find. Research performed on smokers at rest indicates that nicotine (尼古丁) itself can increase basal metabolic (新陈代谢的) rates, meaning smokers burn more energy than nonsmokers during periods of inactivity. But surveys suggest most smokers smoke not while completely at rest, but while performing light activities such as desk work that can increase metabolic rates by two or three times. Unless nicotine’s metabolic effects increase proportionally with metabolic rates, its influence on weight might be insignificant.着县Now a study shows that nicotine’s effects on body-fuel consumption indeed increase proportionally with increases in activity. “These results indicate that the metabolic effect of nicotine may play a greater part in accounting for body-weight differences between smokers and nonsmokers than was previously believed,” says Kenneth A. Perkins and his colleagues at the University of Pittsburgh School of Medicine.着县A) throw atB) a ball made of snow着县着县C) grow rapidly √D) melt easily
题目解答
答案
答案:C
解析
考查要点：本题考查根据上下文推断单词词义的能力，重点在于理解动词“snowball”在语境中的具体含义。
解题核心思路：
- 定位上下文：明确“snowball”所在的句子，关注其前后逻辑关系。
- 分析语境线索：结合段落中“nicotine’s effects on body-fuel consumption increase proportionally with activity”（尼古丁对身体燃料消耗的影响会随着活动量增加而按比例增长）这一关键信息。
- 排除干扰选项：根据语境排除与“增长”无关的选项，锁定正确含义。
破题关键点：
- 动词用法：“snowball”在此处为动词，表示“逐渐累积、增长”。
- 逻辑关系：段落强调尼古丁的代谢效应会随着活动强度的增加而显著增强，需选择能体现“增长”且符合语境的选项。
关键句分析：
原文中“Now a study shows that nicotine’s effects on body-fuel consumption indeed increase proportionally with increases in activity”指出，尼古丁的代谢效应会随着活动量的增加而按比例增长。此处“snowball”作为动词，描述效应的累积性增长。
选项对比：
- A) throw at：与“增长”无关，排除。
- B) a ball made of snow：名词，与动词用法不符，排除。
- C) grow rapidly：符合“效应随活动增加而显著增强”的语境，正确。
- D) melt easily：与“增长”相反，排除。