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... Why is it important to remove dead individuals? A) Because it is easier to manage the living. B) Because it can save money to deal with the waste. C) Because it can provide more space for the living. D) Because it can keep the living from suffering disease.
D
(Question)
Cosmetic ( ) surgery is usually performed to correct a physical abnormality or to enhance an otherwise normal physical feature and thus improve appearance. Cosmetic surgery is an extremely broad field that may offer reconstructive surgery for a patient after a damaging burn or other physical injuries yet can also be used to smooth out wrinkles or reshape a nose. Cosmetic surgery was first used regularly after World War I, when treatment and reconstruction of war injuries gave hope to young soldiers. As recently as fifty years ago, as the rich and famous began opting for elective cosmetic surgery, the subject was whispered about and considered taboo. Celebrities would disappear for months and then appear after secret cosmetic surgery looking younger, prettier, and thinner. Over time, cosmetic surgery has become accepted and even encouraged in some circles. Today there are even television reality shows about it. Some of the more popular forms of cosmetic surgery are liposuction( ), in which excessive fat is sucked out of the body with a tube and vacuum device; laser facial resurfacing, which smooths lines on the face around the eyes and mouth and eliminates facial blemishes ; and hair replacement surgery, which fills in balding areas using a patient's own hair. There are many more forms of cosmetic surgery, including variations of these.Anyone interested in cosmetic surgery should consider the risks and remember that it is, ultimately, surgery. Not all procedures come out exactly the way doctors and patients foresee, and recovery is just like any other surgery, complete with pain and the possibility of infection . While cosmetic surgery is an option, patients should choose doctors wisely,obtain several references, and keep realistic expectations. Which kind of person doesn't need a cosmetic surgery? A) A person who suffers a damaging burn. B) A person who wants to reshape nose. C) A person who needs to smooth out wrinkles. D) A person who wishes to get rid of headache.
(Answer)
D
Ques: Generic Name: ASPIRIN Pronunciation: ['aesp@rin] Why it is prescribed : 1. Aspirin relieves mild to moderate pain. 2. It reduces fever, redness, and swelling. 3. It prevents blood from clotting . When it is to be taken: 1. Aspirin is often taken without a prescription. 2. Follow the instructions on the label and package. 3. If your doctor prescribes aspirin for you, you will receive specific instructions for how often you should take it. 4. Keep in touch with your doctor. How it should be taken: 1. Aspirin comes in the form of suppositories , capsules, and regular, coated, extended-release, and chewable tablets. 2. Regular, coated, and extended-release aspirin tablets and capsules should be swallowed with a full glass of water or milk after meals to avoid stomach upset. 3. Chewable aspirin tablets may be chewed, crushed, dissolved in a liquid, or swallowed whole; a full glass of water, milk, or fruit juice should be drunk immediately after taking these tablets. Special Instruction: 1. Children should not take aspirin for fevers associated with flu or chickenpox because such use has been linked with a serious illness known as Reye's syndrome. 2. Adults should not take aspirin for pain for more than 10 days (five days for children) without consulting a doctor. 3. Aspirin should not be taken by adults or children for high fever, fever lasting longer than three days without a doctor's supervision . 4. Do not give more than five doses to a child in a 24-hour period unless directed to do so by a doctor. 5. If you miss a dose, take the missed dose as soon as you remember it and _ the prescribed schedule. Side Effects: 1. Although side effects from aspirin are not common, they can occur. 2. Nausea, vomiting, stomach pain, indigestion and heartburn are common. Take aspirin after meals, with a full glass of water or milk. If these effects continue, contact your doctor. 3. Ringing in the ears, bloody or black stools , difficulty breathing, dizziness, mental confusion and sleepiness are rare. Stop taking the... Which of the following about Aspirin is correct? A) It only comes in the form of regular tablets. B) It should not be taken for more than 5 days for children. C) It can be used to reduce fever and pain and prevent blood clotting. D) It causes ringing in the ears or difficulty breathing after being taken
Ans: C
NOTICE DO NOT FISH FOR FOOD, FISHERMAN! FOR YOUR OWN HEALTH FISH FROM THESE WATERS SHOULD NOT BE EATEN BECAUSE OF MERCURY POLLUTION Office of Land and Forests After the fisherman read the notice, they will feel _ . A) happy B) excited C) interested D) disappointed
D