（A）
Scientists have known for years that people who exercise tend to live longer than those who do not. Perhaps one of the best things we can do for our bodies is to 1 (simple) take a walk. Some people might think that walking is not intense(剧烈的) enough 2 备战高考(offer) any health benefits. They may say that playing sports or running hard would be much better because they tend to use more energy.
Walking also has many 3 (hide) benefits, which we are just starting to understand. One of the best things about walking is that it can strengthen our hearts. Walking will pump blood faster and give our circulatory system(血液循环系统）a workout. This also helps to control blood 4 (press). As a result, we can lower 5 chance of having a stroke by up to 27 percent.
Even a short 30-minute walk 6 3 kilometers per hour can burn 75 calories for a person who
7 (weigh) 60 kilograms. A daily walking routine can be a good part of an overall weight loss plan. Studies show that about 75 percent of people who try to lose weight by 8 (jog) will give up within six months.
Walking causes the brain to release endorphins(内啡肽) throughout the body, 9 helps to lighten our mood. They also make us feel 10 (relax), more alert and happier. Walking is an excellent way to reduce stress and anger.
（B）
Newly-developed robotic arms _______1________(show)on Tuesday in east China's Anhui Province. The robotic arms, developed by researchers at the University of Science and Technology of China(USTC), have advance grasping abilities compared 2 those on the market. They can complete flexible movements including 6 3 (pick) up pieces of paper, bowls, soft tofu and cakes and placing them in certain places accurately. With the arms, robots can grasp and place different objects 4 (steady) after judging the shape and size of the item.
The current robotic arms in China can hardly conduct such complex movements, 5 imported robotic arms with such functions are very expensive."The new robotic arms cost no more than 1 , 000 yuan , " said Chen Xiaoping , 6 ( direct ) of the Robotics Laboratory at USTC, adding that this gives them an advantage for much 7 (wide) application.
According to Chen , the arms 8 ( be ) first installed on " Kejia " , 9 home service robot developed by USTC, and are expected 10 (use) in more fields such as the elderly care services and logistics in the future.
（C）
Have you ever wondered how many calories are in the human body ? Or have you ever wondered why old people have 1 (big) ears than they used to? The winners of Ig Nobel Prizes(搞笑诺贝尔奖）have got the answers.
The Ig Nobel Prizes, founded in 191, are to honor achievements 2 first make peo
ple laugh, and then make them think. The ceremony 3 (take) place at Harvard University every year. Winners' acceptance 4 (speech) are limited to 60 seconds, 5 (strict) policed by an eight-year-old girl.
The honored research might seem ridiculous 6 first sight, but that doesn't mean it lacks scientific value. For example, the research in 206 on why dry spaghetti tends to break into more than two pieces was important 7 (discover)the failure in bridge spans(跨距）or human bones.And a follow-up paper 8 (publish) by MIT physicists several years later.But people are more likely to read the article about 9 (break)spaghetti. Even when there is no immediate usefulness, 10 is still good to encourage people to observe and think.
（D）
PM stands for particulate (微粒的)matter: the term for a mixture of solid particles(粒子) and liquid droplets in the air. Some particles are large or dark enough to be seen by our eyes. Others are so small that they can only 1． (discover) with a microscope.
These particles come in many sizes and 2． (shape) and can be made up of many different chemicals. Some come directly from a source, such as fields or fires. Most particles form 3． the atmosphere as a result of complex reactions of chemicals, 4． are pollutants from power plants, industries and automobiles.
Particulate matter 5． (contain) microscopic particles that are so small that they can be breathed in and make one 6． (serious) ill. Some particles less than 10 micrometers in diameter can get deep into your lungs 7． some may even get into your bloodstream. Of these, particles less than 2.5 micrometers in diameter, also known as PM2.5, create the 8． (great) risk to health.
Fortunately, every day the Air Quality Index (AQI) tells you how clean or 9． (pollute) your outdoor air is, along with associated health effects that may be of concern. The AQI translates air quality data into numbers and colors that help you understand when 10． (take) action to protect your health.
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