I'm taking a test and have to guess the right answer to the question after the article. Article: Interactive Home-security Systems Tarik Celebi, who lives in San Francisco suburb, takes his home-security system with him to work, to dinner, just about anywhere.By his cell phone, he "arms" his home-security alarm from his car before he leaves for work.During his workday, he gets e-mail alerts every time his front door opens, even though he's miles away.If the door opens at an unusual time -say midday when no one should be coming or going - he can order a 30-second video clip from the camera that watches the door.If it's just his mother-in-law getting a package delivery, no worries. Celebi is one of the first users of the latest interactive home-security systems.In addition to sounding alarms when the house is broken into and notifying homeowners or police, as traditional systems do, the interactive systems give users new ways to remotely control their systems and their home environment.Different from traditional home-security alarms, which homeowners typically have to press buttons on a keypad to turn on before they leave their homes, the interactive systems enable consumers to arm and disarm systems from smart phones, iPads and PCs, no matter where they are. Most traditional systems are set up to sound an alarm if doors or windows are opened. The interactive systems give homeowners more options.For example, users can elect when they want to be notified.They might want an e-mail or a text every time a door is opened, or only during the hours of 3 to 4 p.m., when kids come home from school.Like Celebi, they can add cameras and get video clips when doors open.That could be helpful in making sure kids aren't bringing friends home when they're not supposed to. Nationwide, about 20% of homes have.traditional home-security systems.About half stop using them because they tire of the trouble.Being able to arm systems even while dashing to the subway or while at work will increase their usage of the new interactive systems.Although the new functions add costs to home security, the interactive-systems are believed... Question: What's the advantage of the interactive systems over the traditional ones? Options: A: They are cheaper. B: They are easier to set up. C: They can give quicker reaction. D: They have more ways to inform the users.
D

I'm taking a test and have to guess the right answer to the question after the article. Article: We now think of chocolate as sweet, but once it was bitter. We think of it as a candy, but once it was a medicine. Today, chocolate can be a hot drink, a frozen dessert, or just a snack. Sometimes it is an ingredient in the main course of a meal. Mexicans make a hot chocolate sauce called mole and pour it over chicken. The Mexicans also eat chocolate with spices like chili peppers. Chocolate is a product of the tropical cacao tree. The beans taste so bitter that even the monkeys say "Ugh!" and run away. Workers must first dry and then roast the beans. This removes the bitter taste. The word "chocolate" comes from a Mayan word. The Mayas were an ancient people who once lived in Mexico. They valued the cacao tree. Some used the beans for money, while others crushed them to make a drink. When the Spaniards came to Mexico in the sixteenth century, they started drinking cacao too. Because the drink was strong and bitter, they thought it was a medicine. No one had the idea of adding sugar. The Spaniards took some beans back to Europe and opened cafes. Wealthy people drank cacao and said it was good for the digestion. In the 1800s, the owner of a chocolate factory in England discovered that sugar removed the bitter taste of cacao. It quickly became a cheap and popular drink. Soon afterwards, a factory made the first solid block of sweetened chocolate. Later on, another factory mixed milk and chocolate together. People liked the taste of milk chocolate even better. Besides the chocolate candy bar, one of the most popular American snacks is the chocolate chip cookie. Favorite desserts are chocolate cream pie and of course an ice cream sundae with hot fudge sauce. Question: It can be inferred from the passage that _ . Options: A: chocolate can be a hot drink, a frozen dessert, or a candy bar B: Mexicans like chocolate very much C: chocolate is a product of the cacao tree D: people liked the taste of chocolate mixed with milk
B

I'm taking a test and have to guess the right answer to the question after the article. Article: For many years, scientists have wondered how Chrysopelea paradisi, known as the "flying" snakes, can stay afloat as they leap from one tree to another, sometimes covering a distance of as long as 79 feet. Now a new study has explained that it may be all to do with the way they move. The report was published by Virginia Tech scientist, Jake Soeha who has been studying the flying snakes for a number of years. He began his research by first focusing on its launch technique. He discovered that the snakes first make themselves completely flat and then move side to side; they glide rapidly at a speed of between 26-33 feet per second, before leaping off. Once they take off, their bodies actually tilt at about a 25-degree angle to the airflow created by their flight. When they first leap, the snakes start to drop altitude to pick up speed. With the front of their bodies held stiff, they start a strange air-gliding dance, by moving from side to side. This turns their entire body into one big wing, allowing them to glide across long distances. The findings are not only exciting because they solve the puzzle of how the snakes are able to fly, but also because the same principles could be used to build small flying instruments. The flying snakes that are native to South and South East Asia spend most of their lives in trees in the lowland tropical forests. They grow between 2-3 feet long and are about as wide as a human finger. As would be expected, the smaller and lighter ones are more able to "glide" for longer distances than the bigger and heavier ones. They are not the only wingless animals that can fly -- there are flying frogs that use similar gliding techniques to make their way across forests. Question: The best title for the passage is_. Options: A: New Flying Animals B: Small Flying Instruments C: The New Findings D: Flying Snakes
D