单选题The food you eat does more than provide energy. It can have a dramatic effect on your body's ability to fight off heart disease, cancer, diabetes, high blood pressure, stroke, and weak bones. With remarkable consistency, recent research has found that a diet high in plant-based foods—fruits, vegetables, dried peas and beans, grains, and starchy staples such as potatoes—is the body's best weapon in thwarting many health-related problems. These foods work against so many diseases that the same healthy ingredients you might use to protect your heart or ward off cancer will also benefit your intestinal tract and bones. Scientists have recently estimated that approximately 30 to 40 percent of all cancers could be avoided if people ate more fruits, vegetables, and plant-based foods and minimized high-fat, high-calorie edibles that have scant nutritional value. Up to 70 percent of cancers might be eliminated if people also stopped smoking, exercised regularly, and controlled their weight. In the past, researchers had linked fat consumption with the development of cancers, but they currently believe that eating fruits, vegetables, and grains may be more important in. preventing the disease than not eating fat. "The evidence about a high-fat diet and cancer seemed a lot stronger several years ago than it does now," says Melanie Polk, a registered dietitian and director of nutrition education at the American Institute for Cancer Research. The road to strong bones is paved with calcium-rich food. Leafy green vegetables and low-fat dairy products are excellent sources of calcium, the mineral that puts stiffness into your skeletal system and keeps your bones from turning rubbery and fragile. Your body uses calcium for mom than keeping your bones strong. Calcium permits cells to divide, regulates muscle contraction and relaxation, and plays an important role in the movement of protein and nutrients inside cells. If you don't absorb enough from what you eat to satisfy these requirements, your body will take it from your bones. Because your body doesn't produce this essential mineral, you must continually replenish the supply. Even though the recommended daily amount is 1,200 mg, most adults don't eat more than 500 mg. One mason may have been the perception that calcium-rich dairy products were also loaded with calories. "In the past, women, in particular, worded that dairy products were high in calories, "says Letha Y. Griffin, M. D., of Peachtree Orthopaedics in Atlanta." But today you can get calcium without eating any high-fat or high-calorie foods by choosing skim milk or low-fat yogurt. "Also, low-fat dairy products contain phosphorous and magnesium and are generally fortified with vitamin D, all of which help your body absorb and use calcium. If you find it difficult to include enough calcium in your diet, ask your doctor about supplements. They are a potent way to get calcium as well as vitamin D and other minerals. But if you rely on pills instead of a calcium-rich diet, you won't benefit from the other nutrients that food provides. Getting the recommended vitamin D may be easy, since your body makes the vitamin when your skin is exposed to the sun's rays.

单选题No one really knows who composed this piece of music, but it has been ______ to Bach. A. identified B. associated C. referred D. attributed

单选题[Focus on semantic roles] A. goal B. rheme C. instrument D. causative

单选题{{B}}Directions:{{/B}}Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some{{U}} (1) {{/U}}by the position of the Sun. Others navigate by the stars. Some use the Sun as{{U}} (2) {{/U}}guide during the day, and then{{U}} (3) {{/U}}to star navigation by night. One study shows that the homing pigeon uses the Earth's magnetic fields as a guide{{U}} (4) {{/U}}finding its way home, and there are indications that various other animals, from insects to mollusks (软体动物), can also make{{U}} (5) {{/U}}of magnetic compasses.{{U}} (6) {{/U}}is of course very useful for a migrating bird to be able to switch to magnetic compass when clouds cover the sun;{{U}} (7) {{/U}}it Would just have to land and wait for the Sun to come out again.{{U}} (8) {{/U}}with the Sun or stars to steer by, the problems of navigation are more complicated{{U}} (9) {{/U}}they might seem at first. For example, a worker honeybee{{U}} (10) {{/U}}has found a rich source of nectar and pollen flies rapidly home to the hive to{{U}} (11) {{/U}}: A naturalist has discovered that the bee scout{{U}} (12) {{/U}}her report through complicated dance in the hive,{{U}} (13) {{/U}}she tells the other workers not only how far away the food is, but also what direction to fly in{{U}} (14) {{/U}}to the Sun.{{U}} (15) {{/U}}the Sun does not stay in one place all day. As the workers start{{U}} (16) {{/U}}to gather the food, the Sun may{{U}} (17) {{/U}}have changed its position in the sky somewhat. In later trips during the day, the Sun seems to move farther and farther toward the west. Yet the worker bees seem to have no{{U}} (18) {{/U}}at all in finding the food source. Their inner{{U}} (19) {{/U}}tell them just where the Sun will be, and they change their course{{U}} (20) {{/U}}.

单选题The nuclear family ______a self-contained, self-satisfying unit composed of father, mother and children.

单选题Intelligence test scores follow an approximately normal distribution, (meaning) that most people score near the middle of the distribution of scores, (and) scores (drop off) fairly rapidly in frequency as one moves in (either) direction from tile center.A. meaningB. andC. drop offD. either

单选题1. As the U. S. economy tries to fight off a recession, has it found a way to avoid a knockout? So far, strength in many service industries is delivering a powerful counterpunch to hits from homebuilding, autos, and other goods-producing businesses. Despite the economy's tepid 0.6% growth rate last quarter, its service sector advanced a sturdy 3.5%. Consumer spending on goods plunged 2. 6% , but outlays for housing, medical care, and other services rose 3. 4%. Heading into the second quarter, while overall April payrolls shrunk by 20, 000 jobs, services added 90, 000. And in contrast to the weakness in manufacturing, the Institute for Supply Management says April service-sector activity continued to grow. 2. There's no denying the sector 's increasing impact on economic trends. Services make up almost 60% of gross domestic product, up from 55% a decade ago and 52% the decade before that. However, despite that growing influence, the more important engines of the business cycle have always been the goods-producing sector and construction, and they are taking an unusually heavy pounding. 3. This sharp divergence reflects the unique set of forces affecting the economy, especially consumers. The mix of tighter credit, the double hit to buying power from fewer jobs and higher prices for energy and food, and shrinking household wealth are killing demand for big-ticket consumer goods such as homes, cars, and other discretionary purchases. 4. Even as credit is drying up, jobs and incomes are shrinking. Since payrolls peaked in December, service employment through April is up 98, 000, but goods-producing jobs have plunged 358, 000. Overall, more people are having trouble finding full-time work. This year's rise in the number of people forced to work part-time is the fastest since the 2001 recession. Total hours worked began the second quarter well below their first-quarter level, and with hourly pay slowing, income growth, almost all of which has been eaten up by inflation over the past year, began the quarter on a weak note. 5. So far, despite consumers' weaker incomes, their savings rate remains close to the near-zero level of the past two years, implying they are spending about the same proportion of their earnings. That means factors other than income have not yet had a negative impact on spending, but that trend will be put to the test this quarter. 6. As household wealth, which had helped to make up for low savings, falls, along with credit availability and consumer confidence, consumers may soon be forced to save more of their incomes. There's a good chance the tax rebates will be either squirreled away or used to pay down credit cards. A shift to greater saving would tend to hit outlays for both goods and services. 7. On balance, recession forces appear to be getting stronger this quarter, not weaker. That will put even more pressure on the goods sector. And while the service sector's resilience may help to keep the recession mild, it won't necessarily be able to prevent one.

单选题Although he did not feel well, he insisted ______ going there together with us. A) to B) on C) at D) for

单选题{{B}} Directions: For each blank in the following passage, choose the best answer from the choices givenbelow. Mark your answer on the ANSWER SHEET by drawing with a pencil a short bar acrossthe corresponding letter in the brackets.{{/B}} Vitamins are organic compounds necessary in small amounts in the diet for the normal growthand maintenance of life of animals, including man. They do not provide energy,{{U}} 31 {{/U}}do they construct or build any part of the body. They areneeded for{{U}} 32 {{/U}}foods into energy and body maintenance. There are thirteen or more of them,and if{{U}} 33 {{/U}}is missing a deficiency disease becomes{{U}} 34 {{/U}} Vitamins are similar because they are made of the same elements-usually carbon,hydrogen, oxygen, and{{U}} 35 {{/U}}nitrogen. They are different{{U}} 36 {{/U}}their elements are arrangeddifferently, and each vitamin{{U}} 37 {{/U}}one or more specific functions in the body. {{U}} 38 {{/U}}enough vitamins is essential to life, although the body has no nutritional use for {{U}} 39 {{/U}}vitamins. Many people,{{U}} 40 {{/U}}, believe in being on the "safe side" and thus takeextra vitamins. However, a well-balanced diet will usually meet all the body' s vitamin needs.

单选题In the ______ century, if a man took more than his share of salt, he would ______.

单选题Like most people, I was brought up to look upon life as a process of getting. It was not until in my late thirties that I made this important discovery: giving-away makes life so much more exciting. One discovery I made about giving-away is that it is almost impossible to give away anything in this world without getting something back, though the return often comes in an unexpected form. One Sunday morning the local post office delivered an important special delivery letter to my home, though it was addressed to me at my office. I wrote the postmaster a note of appreciation. More than a year later I peeded a post-office box for a new business I was starting. I was told at the window that there were no boxes left, and that my name would have to go on a long waiting list. As I was about to leave, the postmaster appeared in the doorway. He had overheard our conversation. "Wasn't it you that wrote us that letter a year ago about delivering a special delivery to your home?" I said it was. "Well, you certainly are going to have a box in this post office if we have to make one for you. You don't know what a letter like that means to us. We usually get nothing but complaints. "

单选题The application of infrared scanning technolgy to agriculture met with some difficulties due to ______. A. the lack of official support B. its high cost C. its failure to help increase production D. the lack of financial support

单选题Moshe Katzma, 24, denied any ______ with the beating given to the homeless man, who was found outside a National Headquarters office. A. involvement B. admission C. isolation D. access

单选题The fight could have been avoided if both of you had been able to ______ your anger. A. hold back B. hold on C. hold out D. hold up

单选题One of his eyes was injured in an accident, but after a ______ operation, he quickly recovered his sight. A. delicate B. considerate C. precise D. sensitive