Worried about how many calories( ) you are going to get in that piece of pizza, chocolate cake or bag of chips? A new iPhone application that takes a picture of the meal with the phone and gives a calorie read-out almost at once, may help. The MealSnap was developed by DailyBurn, a fitness social network that has created several other fitness and diet-related iPhone applications. Within minutes of taking a picture of a meal and matching it to the given information of some 500, 000 kinds of food, the application sends users a warning with a range of calories for the meal that was photographed. To start with, we sent it something simple--a Braeburn apple. A couple of minutes later the application replied that it was between 64 and 96 calories. Andy Smith, chief director at DailyBurn, said: "The database can also quickly help recognize the food, how many calories there are, proteins, fat, carbs, vitamins, whatever you may want to know." Mr Smith added that it will take some time to complete calorie counting but the application makes it easier to record the calories in food. That is why it is so popular among those who are trying hard to lose weight. "The pure act of recording something can cause a psychological change that can help people on their health and fitness plan. Just the simple fact of recording it makes me more understand what I'm eating," he said. In addition, MealSnap can serve as a food diary, allowing users to keep a readable record of the meals they have eaten. Mr Smith said:"It's like a food journal, but easier. All you do is take the picture." MealSnap is available on the iTunes store for PS1.79, or $2,99 in the US. Which of the following statements about MealSnap is TRUE? A) People have to link iPhone with the Internet to use it. B) It has been put into the market. C) People will have a physical change by using it. D) It's popular because it was developed by DailyBurn.
B
Warm water freezes more quickly than cold water. Sir Francis Bacon said that almost four hundred years ago. But few people believed him until 1970. In that year a Canadian scientist George Kill proved the English professor was right. Dr Kill filled an open oil pail with cold water. He filled another with warm water. He put both in the same low temperature. The warm water froze first. The lack of covers on the pails is the secret. Some of the warm water changed into vapor. This meant that less of the warm water was left to be frozen. And so the warm water froze faster than the cold water even though it had a greater temperature drop to make. Hundreds of years ago, Sir Francis Bacon found _ . A) the temperature of warm water drops faster than that of cold water B) warm water is heavier than cold water C) warm water has the same temperature as cold water D) warm water is not as useful as cold water
A
Q: Last week, we explained that the planet Mars has passed "opposition. "It passed a point opposite the Sun. This week, we tell about the planet's surprising motion among the stars. For thousands of years, people have recognized that planets travel among the stars. The planets generally follow the path taken by the Sun through the sky. The Sun's path is called the ecliptic. The groups of stars along the ecliptic are called the Zodiac. The motion of the planets can be confusing at times. Everyone knows the Sun rises in the east and sets in the west. But this is caused by the turning motion of the Earth. Planets generally move from west to east. However, Mars will appear to move backward for about two months this year. This happens because the Earth is overtaking Mars on its way around the Sun. Mars began its backward, or westward, motion on May 11th, It will start moving eastward again on July 19th. Mars' apparent motion has been a mystery to astronomers for hundreds of years. Most early theories of the solar system argued that the Sun and planets turned around the Earth. But the sudden westward motion of Mars presented a problem. Why would Mars move west for two months when it nears "opposition"? In 1543, a Polish church worker named Nicolas Copernicus published a different theory. His theory said the Earth and planets moved around the Sun in perfectly circular orbits. Copernicus' theory was simpler. But his Sun - centered system still did not explain the observed motion of Mars very well. Finally, a German mathematician named Johannes Kepler published a complete theory of the motion of the planets in 1619. He had carefully studied the motion of Mars for many years. Johannes Kepler discovered that the planets do not move in circular orbits around the sun. Instead, they travel in flattened orbits called ellipses. Mars' elliptical orbit is the cause of its unusual brightening this year and its apparent large size. During the next several weeks, you can see for yourself why the mysterious motion of Mars has... Why does Mars appear to be bigger and brighter when it passes "opposition"? A) It is overtaking the earth. B) It follows the path of the sun. C) It moves in an elliptical orbit. D) It travels in a circular orbit.
A: C
*Question*
When early colonial settlers went to America, they took many forms of dance to _ . Square dancing, one of the oldest forms of American folk dancing, developed from several different Old World group dances, mainly English country dances, and the French quadrille . In the American version of square dancing, four couples form a square and dance to music. An American addition to square dancing is the caller. What do you think a caller does? The callers---someone who calls out the dance steps in time to the music--- was a completely American invention. At first dancers memorized all the steps for a particular dance, but eventually the dances became so complicated that it was necessary to have someone call out cues so that dancers didn't have to remember so many steps. The caller didn't just call out "do-se-do your partner"; a good caller also came up with colorful sayings or witty lines that he said in between the cues such as "Don't be shy and don't be afraid. Swing on the corner in a waltz promenade ." A caller might also come up with new dance steps and routines. Although popular for years, square dancing seemed to be going out of style and fading away until the early 1930s, when Henry Ford helped revive interest in it. Ford, the automobile manufacturer, used to vacation at the Wayside Inn in Massachusetts, where he enjoyed the dance programme run by a man named Benjamin Lovett. Ford asked Lovett to come to Detroit and teach dances, but Lovett said he couldn't because he had a contract with the inn. Ford solved that problem by buying the inn and Lovett's contract. He took Lovett back to Detroit, where together they established a programme for teaching squares and rounds. Square dancing was updated and groups began forming all over the country. What is the best title for the passage? A) The Different Steps of Square Dancing B) The Origin and Development of Square Dancing C) Who Was the Inventor of Square Dancing? D) Why Did Square Dancing Go Out of Style?
**Answer**
B