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单选题Even as Americans have been gaining weight, they have cut their average fat intake from 36 to 34 percent of their total diets in the past 15 years. And indeed, cutting fat to control or lose weight makes sense. Fat has nine calories per gram. Protein and carbohydrates have just four. Moreover, the body uses fewer calories to metabolize fat than it does to metabolize other foods. Compared with protein and carbohydrates—which break down into amino acids and simple sugars, respectively, and can be used to strengthen and energize the body— dietary fat is more easily converted to body fat. Therefore, it's more likely to stay on buttocks, thighs and bellies. But cutting fat from your diet doesn't necessarily mean your body won't store fat. For example, between nonfat and regular cookies, there's trivial difference in calories because manufacturers make up for the loss of fat by adding sugar. Low-fat crackers, soups and dressings can also be just as high in calories as richer versions. No matter where the calories come from, overeating will still cause weight gain. The calories from fat just do it a little quicker. A Wisconsin computer programmer who decided with a diet coach to eat only 40 grams of fat a day learned the lesson firsthand. He wasn't losing weight. Then he showed his food diary to his coach and revealed he'd been eating half a pound of jelly beans a day. "They don't have any fat, " he explains. But they had enough sugar to keep him from shedding an ounce. Nonfat foods become add-on foods. When we add them to our diet, we actually increase the number of calories we eat per day and gain weight. That was borne out in a Pennsylvania State University study. For breakfast, Prof. Barbara Rolls gave two groups of women yogurt that contained exactly the same amount of calories. One group's yogurt label said "high fat"—the other, "low fat. " The "low fat" yogurt group ate significantly more calories later in the day than the other group. "People think they've saved fat and can indulge themselves later in the day with no adverse consequences, " says Richard Mattes, a nutrition researcher at Purdue University. "But when they do that, they don't compensate very precisely, and they often end up overdoing it. "

He was so______on his work that he didn" t hear her come in.

Generally, vaccine makers______the virus in fertilized chicken eggs in a process that can take four to six months.

Lighting levels are carefully controlled to fall within an acceptable level for optimal reading convenience.

I must leave now.______, if you want that book I"ll bring it next time.

We welcome him not______as a new broom but rather as a very old friend.

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Cholera is a preventable waterborne bacterial infection that is spread through______water.

The tutor tells the undergraduates that one can acquire ______ in a foreign language through more practice.

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单选题Passage One

单选题My little brother practices the speech repeatedly until his Udelivery /Uand timing were perfect.

He tried to run, but he was hampered by his broken leg.

The best exercise should require continuous______, rather than frequent stops and starts.

An immediate search over 1,000 square miles of sea failed to ______ single piece of wreckage.

问答题In this part there is a passage in Chinese. Read it carefully and then write a summary of 200 words in English on the ANSWER SHEET. Make sure that your summary covers the major points of the passage. 学会呼吸能长寿 生命离不开呼吸。人每分每秒都在进行呼吸运动，但你却未必呼吸得正确。英国一项研究显示，90％以上的成年人都不会有意识地调节呼吸。而据我国呼吸科专家统计，城市中一半以上人呼吸方式不正确，短浅的呼吸不仅让许多人大脑缺氧，容易疲惫，而且还容易诱发多种疾病! 深呼吸的几大好处 那么，做腹式深呼吸有哪些好处呢?首先，深呼吸能防治呼吸系统疾病。常见的呼吸系统疾病包括慢性支气管炎、哮喘、肺气肿等。这些病人的肺部都处于无弹性和扩张状态，影响肺活量。而进行深呼吸，能逐步增大肌肉收缩力，有利于胸、肺的有效扩张，增强肋间肌活力，可以逐步恢复其弹性和肺活量，从而达到治疗和缓解病情的目的。 再次，深呼吸能帮助人们减压，缓解失眠症状。北京体育大学运动医学教授陆一帆表示，人们主动调节呼吸的深度和频率，就能有效放松绷紧的神经，舒缓焦虑的心情。一些因为压力造成的颈部疼痛，通过瑜伽时的呼吸练习，疼痛感将会减弱。失眠的人也可用呼吸法来帮助入睡。通过降低呼吸节奏、平缓呼吸，能减轻失眠症状。 其次，深呼吸还可防治高血压。这是日本自治医科大学北村谕教授试验的?种深呼吸降血压法，其原理是人的肺部有被称为肺泡的小袋状物，大约有3亿个。在—般呼吸的情况下，只有其中的80％～90％能充分地工作，剩下的肺泡处于浪费状态。如果采用深呼吸，就可以使剩下的肺泡工作起来。当采用胸部深呼吸的时候，位于肺上部的肺泡开放；而在腹式深呼吸时，肺下部的肺泡也打开了。工作中所有的肺泡都在产生前列腺素，而且通过深呼吸还可使原来就在工作的80％～90％的肺泡产生比原来更多的前列腺素。这样，更多的前列腺素进入血管，从而使血管扩张，血压降低。每天早中晚三次，每次10分钟就有效果。 最重要的是，深呼吸能促进健康长寿。美国学者希尔在《从呼吸索取生命力》一文中指出：“有控制地深呼吸练习，可使大脑尽快消除疲劳，可以调节神经系统，使人轻松舒畅。深呼吸之所以有这样大的作用，在于正常人每次吸进与呼出的气体量只有400毫升～500毫升，而做一次最深的呼吸，男性可达到3500毫升，女性可达到2500毫升，相当于通常吸气的8倍，从而使生命获得大量的能源。” 如何学会正确呼吸 怎样才能学会正确呼吸呢?最关键的有两点，陆一帆指出，一是要缓和吸，也就是吸气的时候，要均匀缓慢，尽量深吸，让气体能充满肺泡；二是要用力吐，吐得干净，这样才能将废弃全部排出体外，保障交换的气体多一些。最科学的呼吸方法为：“吸——停(屏气10一20秒钟)——呼”的呼吸形式，可使副交感神经兴奋性增强，也可使肠鸣次数增加，有利于消化吸收，从而有益于健康长寿。 龙村修提倡的呼吸法，则是以深长的腹式呼吸为基础，逐步使肺、肋骨、横膈膜等肌肉群在呼吸时运动到最大幅度，让空气充满肺部的“全体呼吸法”。“刚开始虽要刻意练习，最终目标却是融入生活，各种姿势和动作都结合呼吸法去做。”龙村修表示，如此将更能掌握身体的力量和节奏，提高效率。例如用呼吸法攀登高山时，比较不会出现头痛等高山症状；打高尔夫挥杆能挥得更远。这种呼吸方法，在公车上、走路时、工作间隙，或者对着公园的树都能练习。尤其面对突如其来的负面情境时，呼吸法更能适时调节身心、稳定情绪。

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