Article: When an ant dies, other ants move the dead insect out. Sometimes, the dead ant get moved away very soon--within an hour of dying. This behavior is interesting to scientists, who wonder how ants know for sure--and so soon--that another ant is dead. One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist. Choe found that Argentine ants have a chemical on the outside of their bodies that signals to other ants, "I'm dead--take me away." But there's a _ to Choe's discovery. Choe says that the living ants--not just the dead ones--have this death chemical. In other words, while an ant crawls around, perhaps in a picnic or home, it's telling other ants that it's dead. What keeps ants from dragging away the living ants?Choe found that Argentine ants have two additional chemicals on their bodies, and these tell nearby ants something like, "Wait--I'm not dead yet." So Choe's research turned up two sets of chemical signals in ants: one says, "I'm dead," and the other set says, "I'm not dead yet." Other scientists have tried to figure out how ants know when another ant is dead. If an ant is knocked unconscious, for example, other ants leave it alone until it wakes up. That means ants know that unmoving ants can still be alive. Choe suspects that when an Argentine ant dies, the chemical that says "Wait-I'm not dead yet" quickly goes away. Once that chemical is gone, only the one that says "I'm dead" is left. "It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard, not because its body releases new unique chemicals after death," said Choe. When other ants detect the "dead" chemical without the "not dead yet" chemical, they drag away the body. Understanding this behavior may help scientists figure out how to stop Argentine ants from invading new places and causing problems. Choe would like to find a way to use the newly discovered chemicals to spread ant killer to Argentine ant nests. The ants' removal behavior is important to the... Question: What might be the best title of the text? Yes or no, is the answer "Dead or living? It is easy to judge"?
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Article: For an increasing number of students at American universities, Old is suddenly in. The reason is obvious: the graying of America means jobs. Coupled with the aging of the baby-boom generation, a longer life span means that the nation's elderly population is bound to expand significantly over the next 50 years. By 2050, 25 percent of all Americans will be older than 65, up from 14 percent in 1995. The change brings many problems for government and society, of course. But it also creates career opportunities in medicine and health professions, and in law and business as well. "In addition to the doctors, we're going to need more sociologists, biologists, urban planners and specialized lawyers," says Professor Edward Schneider of the University of Southern California's (USC) School of Gerontology .www.zxxk.com Lawyers can specialize in "elder law" which covers everything from trusts and estates to nursing-home abuse and age discrimination. Businessmen see huge opportunities in the elder market because the baby boomers, 74 million strong, are likely to be the wealthiest group of retirees in human history. "Any student who combines an expert knowledge in gerontology with, say, an MBA or law degree will have a license to print money," one professor says. Margarite Santos is a 21-year-old senior at USC. She began college as a biology major but found she was "really bored with bacteria." So she took a class in gerontology and discovered that she liked it. She says, "I did volunteer work in retirement homes and it was very satisfying." Question: ."...Old is suddenly in" (Line 1, Para. 1) most probably means " _ ". Yes or no, is the answer "gerontology has suddenly become popular"?
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Article: A man was cleaning car with a special brush when a little girl who had been watching him said,"My daddy has a brush like that to clean his car too.""Really!"said the man."What kind of car does your daddy have"The little girl answered,"Oh, he hasn't got the car yet, but he's got the brush to clean it."Well, I suppose you have to start somewhere! The important thing is that you do get started. And to do that, we first have to decide what kind of life we want. It's strange how many of us want to live forever, when we can't even decide what to do with our life now! Like the guy who said,"I'm going to stop putting things off, starting tomorrow." You see, even if others have made decisions for you, you can still decide how you'll respond and handle the life that's been handed to you. You still have control of your own attitudes. Happiness is an attitude and choice, no matter what situation you're in. Remember, you can always find someone worse off than you whom you can help. It's only when we stop looking at our own problems and reach out to make others happy that we ourselves can be truly happy. But if you choose not to make a decision that also is your decision you'll live with. There are many smart, talented people who have never enjoyed the success they could have, simply because they could not make a decision and discipline themselves to follow through with it. Remember, if your life doesn't change, it's going to stay the same! It's that simple. So to move on from where you are, you must first decide where you'd rather be. If you can't change your mind, you can't change your life. The great writer Tolstoy said,"Everyone wants to change the world, but no one wants to change himself."So ask yourself right now: What's the one decision I need to make to change my life? Think a minute! Question: The best title of the text is_. Yes or no, is the answer "Decide a goal and get started"?
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Article: Don't you hate it when someone snubs you by looking at their phone instead of paying attention? The word "Phubbing", which comes from "phone" and "snub", describes such behavior . With popularization of smart phones, we see a new "Phubbing" group everywhere in public places: in subway, restaurants, roads, people are checking the mobile phone, ignoring the people around completely. What is worrying us is that not only young people, but also the elderly and kids are getting addicted to Phubbing. On Dec 29th, a 28-year-old woman--a mother of two in Wenzhou, drowned after she fell into a river while looking at her mobile phone. A Pakistani man was killed on Dec 15th, 2015, after being hit by a fast moving train while trying to take a selfie with it on the track. Last month, Justin, a college student was shot in subway in San Francisco, the U.S. The surveillance video showed that before Justin was killed, the killer pulled out the gun several times, and even wiped his nose with it. However, nobody noticed that. The surrounding passengers all focused on their cell phones. Phone is the tool for communication, but now it distances people and makes them separated from each other. Therefore, someone jokes "the furthest distance in the world is not the distance between life and death, but that you don't know I stand in front of you while you focus on the mobile." Phubbing appears harmless; however, it does affect our life. 23-year-old Alex from Melbourne wrote in his blog: "I can no longer focus on what I am eating since I started twittering. My skill of food photography has improved very fast, while my interest in food drops a lot as a result." Question: The author wants to tell us in the passage that _ . Yes or no, is the answer "it's time for us to stop phubbing"?
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