Read the following article and select the best answer. Article: The speed of light is often called a"constant ". New experiments show that may not be true, even within a vacuum. Sometimes, light slows a bit. The new research is"very impressive work", Robert Boyd toldScienceNews.An optical physicist at the University of Rochester in New York, he did not work on the study. He speaks of the new finding:"It's the sort of thing that's so obvious; you wonder why you didn't think of it first." Light travels as particles and as waves. Photons are the name given to those particles that represent the smallest possible amount of light. At their fastest, photons travel nearly 300 million meters (almost 1 billion feet) in a single second. That's fast enough to get to the moon and back in about 2.6 seconds. Scientists had long known, though, that they could slow light photons down by shining them through a material such as glass or water. Still, light moving through a vacuum has usually been assumed to move at a peak speed. That would seem to make sense. After all, a vacuum is a space with nothing in it to slow light down. In a new study, however, scientists show that even racing through a vacuum, light can slow. So the speed of light is more of a universal speed limit than an rule for how fast photons travel, the new data suggest. Miles Padgett led the new study. As an optical physicist, he works at the University of Glasgow in Scotland. He and his colleagues showed that the key to slowing light is to change the shape of a light wave. Padgett described how they did this in a paper published online January 22 inScience. His team raced a pair of photons. One traveled unchanged through a cable made from optical fibers. The other passed through a pair of devices that acted like lenses. A lens changes light: It can focus a spread-out beam of light on a point, for instance. The second photon passed through one device that changed the shape of its waveand another that changed it back to its original form. The first photon won the race. The second photon came in a tiny bit later, several... Question: What does the study led by Miles Padgett mainly suggest? - Light travels fastest through a vacuum. - There's a minimum limit to the speed of light. - Devices like lenses slow down the speed of light. - Light photons can't travel through lenses easily.
Devices like lenses slow down the speed of light.

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Read the following article and select the best answer. Article: The day my fiance fell to his death, it started to snow, just like the bottom hadn't fallen out of my world when he fell off the roof. His body, when I found it, was lightly covered with snow. It snowed almost every day for the next four months, while I sat on the couch and watched it pile up. One morning, I shuffled downstairs and was surprised to see a snowplow clearing my driveway and the bent back of a woman shoveling my walk. I dropped to my knees, crawled through the living room, and back upstairs so those good Samaritans would not see me. I was _ . My first thought was, how would I ever repay them? I didn't have the strength to brush my hair, let alone shovel someone's walk. Before Jon's death, I took pride in the fact that I rarely asked for help or favors. I defined myself by my competence and independence. How could I respect myself if all I did was sit on the couch everyday and watch the snow fall? Learning how to receive the love and support that came my way wasn't easy. Friends cooked for me and I cried because I couldn't even help them set the table. "I'm not usually this lazy," I swept. Finally, my friend Kathy sat down with me and said, "Mary, cooking for you is not a burden. It makes me feel good to be able to do something for you." Over and over, I heard similar words of comfort from the people who supported me during those dark days. One very wise man told me, "You are not doing nothing. Being fully open to your grief may be the hardest work you will ever do." In many ways I have changed for the better. I have been surprised to learn that there is incredible freedom that comes from facing one's worst fear and walking away whole. Question: What made the author feel sad? - Her fiance's sudden death. - Constant heavy snow. - Her fiance abandoning her. - Her job being refused again.
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Her fiance's sudden death.

Ques:Read the following article and select the best answer. Article: Have you ever lost your car on a parking lot? You don't have a clue where your car is after shopping. Then you start walking around clicking on your car keys so the alarm goes off. It can be annoying, especially on a hot sunny day. No, you needn't install an expensive GPS system to keep track of your car. That's too expensive. You would need to pay a monthly fee to use it. But is there a way to track your vehicle without spending a fortune? Yes, now there is! A California-based company has created a tiny device that works with your smartphone, which could be exactly what you're looking for! What is it? It's called TrackR. It is a state-of-the-art tracking device the size of a coin. It's changing the way we keep track of the important things in our lives. How does it work? It's easy! Install the free TrackR app on your smartphone, connect the app to your device and you're ready to go! Simply attach TrackR to whatever you want to keep an eye on. The entire process of setting it up only takes 5 minutes or less. You can attach it to your keys, briefcase, wallet, your latest tech gadgets and anything else you don't want to lose. Then use the TrackR app to locate your missing item in seconds. If you forget where you have parked your car, pull out your smartphone and open the TrackR app. Tap on the "find device" button on the screen and the app will tell you the exact spot of the last known location of the TrackR. What else can I do with TrackR? The device is small and unnoticeable enough that you can attach it to your pet. Put it on their collar, and the issue of searching for them when they run away to nearby places will be over! You'll never waste a minute searching the whole house for it. TrackR even comes with a double-sided glue so you can stick it to your laptop or under your bike seat. Track down and punish the thieves who steal your expensive things! How much does it cost? You're probably thinking that this device is very expensive. False! TrackR only costs $29! That's a small price to pay for peace of... Question: This passage is mainly developed by _ . - answering questions - providing statistics - listing advantages - making comparisons

Ans:
answering questions