单选题
Many millions of people have high blood pressure(hypertension 高血压). What's so frightening about this so called silent killer is that it often does not produce {{U}}(51) {{/U}}for years, secretly damaging arteries and organs throughout the body until it erupts (爆发) in the form of stroke, heart attack, congestive heart failure(充血性尽力衰竭) or kidney disease. {{U}}(52) {{/U}} left untreated, even mild hypertension can reduce the life expectancy of a 35-year-old {{U}}(53) {{/U}} several years. (Readings of 140 to 159 over 90 to 99 are mildly high; about 120/80 is normal. )
That's why high blood pressure is commonly treated with anti-hypertensive drugs. But studies {{U}}(54) {{/U}} that in some people an increase in calcium(钙) consumption can help {{U}}(55) {{/U}} blood pressure without medication(药物治疗)。
Calcium also seems to help prevent high blood pressure. {{U}}(56) {{/U}} the results of 13-year survey {{U}}(57) {{/U}} by the U.S. National Center for Health Statistics, James H. Dwyer, associate professor of {{U}}(58) {{/U}} medicine at the University of Southern California School of Medicine, found that people who consumed 1300 milligrams of calcium a day were 12 percent {{U}}(59) {{/U}} likely to develop hypertension than those {{U}}(60) {{/U}} only 300 mg. a day. In people under age 40, risk was reduced by up to 25 percent.
Soon doctors may {{U}}(61) {{/U}} some hypertension patients to increase their calcium intake, {{U}}(62) {{/U}} the way they now advise sodium(钠) restriction. "It's {{U}}(63) {{/U}} to add food or supplements than to go on a low-sodium diet," {{U}}(64) {{/U}} Dr. David McCarron, professor of medicine at Oregon Health Sciences University. "Our studies show that people who try the low-sodium {{U}}(65) {{/U}} don't stay with it very long. "
【正确答案】 B
【答案解析】[词义辨析] symptoms意为“(疾病之)症兆、症状”。evidence意为“证据、迹象”，强调事实证据情况。mark意为“标记、记号”。sign电可表示“迹象、征兆”，应用于能看见、感知的东西，以它作为某种可预知的事件要发生的客观证据。例如：Those big，black clouds are signs of a storm.
【正确答案】 D
【答案解析】[句型定位] 本句为省略条件句“if(a patient was)left untreated…”。
【正确答案】 A
【答案解析】[句意剖析]“by”与“reduce”连用表示“减少……”。该句意为“假如病人不及时治疗的话，即便是轻微的高血压也将会使一个35岁的人寿命缩短好几年”。
【正确答案】 A
【答案解析】[句型定位] suggest在这里意为“表明”而非“建议”，故其宾语从句不用虚拟式(should+原形动词)。
【正确答案】 A
【答案解析】[直接定位] 这里不可用relieve一词。relieve之后接宾语表示“使(痛苦，问题，不安心情，烦恼等)减缓，减轻”。
【正确答案】 C
【答案解析】[词义辨析] evaluate意为“估计、评价”，强调评空人或物的价值。estimate也表示“估计、估价”，指一个人根据其个人知识、经验或个人认识作估计，并强调其估计之结果可能是错误的。calculate表示“计算、核算”，不合句意。
【正确答案】 B
【答案解析】[词义辨析] undertake意为“承担、从事”之意。undergo意为“遭受、经历(痛苦、变化等)”。underdo意为“不尽全力做……”；convey意为“传送、传达”，均不合句意。
【正确答案】 A
【答案解析】[前后呼应] preventive medicine意为“预防药物”。该段第一句“Calcium also seems to help prevent high blood pressure”可帮助判断。
【正确答案】 C
【答案解析】[直接定位] be less likely to…意为“可能性小于……”，合句意。
【正确答案】 B
【答案解析】[直接定位] consuming是现在分词作后置定语。
【正确答案】 C
【答案解析】[逐项排除] urge意为“鼓励，力劝”。可说urge sb. to do sth. 。suggest也符合句意，但该词不能用不定式作其宾语补语，即不能说suggest sb. to do sth.。demand也不能用于此类结构。
【正确答案】 A
【答案解析】[直接定位] much the way(=much(in)the way…)意为“几乎以同样的方式……”。
【正确答案】 B
【答案解析】[直接定位] 下句“people who try the low-sodium approach don't stay with it very long”可帮助判断。
【正确答案】 B
【答案解析】[词义辨析] assert意为“断言、宣称”，尽管有时有证据证明其所言不确，但声称者相信自己正确无疑。announce、declare都表示“(正式公开地)宣布、宣告”，而declare尤指官方正式宣告。
【正确答案】 C
【答案解析】[词义辨析] approach指为达某一特殊的目的而采取的初步步骤，以及为采取这些步骤所用的特殊方法，正合题意。method指系统或规则的方法。way也可表示“方法”，但它指一个概念笼统、含义不明确的方法，一般不涉及具体、单一的技术。