In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Article: Kellyanne O'Niell had not even completed her first aid course when she was called upon to put her skills into action. Just halfway through her course, which was offered by Kilcooley Women's Education Group, Kellyanne was walking home when she found herself faced with an emergency. A youngster on the street had fallen onto broken glass. Describing the situation, Kellyanne said:"I noticed she fell onto some glass, and when she got up, I spotted a big wound starting at the thumb and finishing at the ring finger. I started applying pressure to the bleeding wound at once and sent someone to bring my first-aid box from my house." She continued: "I phoned for an ambulance and gave the lady every last detail that she wanted to know. I got another person to keep an eye out for the ambulance. The young girl was in great pain so she couldn't stay still. I was scared she was not going to respond to me. I held her hand above the heart so that the bleeding could at least stop a little bit." "Once the person came back with the bandage, the ambulance was there. The nurse got me to hold a flashlight for her while she bandaged the wound. Once the girl was all bandaged up, I helped her onto the seat in the ambulance and she was taken to hospital." Margaret Pridgen, the British Red Cross trainer who had been teaching Kellyanne, was full of praise for her swift action. She said:"I think this is quite an achievement for this young girl, I have really seen her confidence grow during the training and am delighted she had the poise to be able to deal with the situation and put her new skills into practice."
Answer: Margaret was satisfied with Kellyanne.
We can learn from the text that _ .

Article: Eating too much fatty food, exercising too little and smoking can raise your future risk of heart disease. But there is another factor that can cause your heart problems more immediately: the air you breathe. Previous studies have linked high exposure to environmental pollution to an increased risk of heart problem, but two analyses now show that poor air quality can lead to heart attack or stroke within as little as a few hours after exposure. In one review of the research, scientists found that people exposed to high levels of pollutants were up to 5% more likely to suffer a heart attack within days of exposure than those with lower exposure. A separate study of stroke patients showed that even air that the U. S. Environmental Protection Agency (EPA) considers to be of "moderate" quality and relatively safe for our health can raise the risk of stroke as much as 34% within 12 to 14 hours of exposure. The authors of both studies stress that these risks are relatively small for healthy people and certainly modest compared with other risk factors such as smoking and high blood pressure. However, it is important to be aware of these dangers because everyone is exposed to air pollution regardless of lifestyle choices. So stricter regulation by the EPA of pollutants may not only improve environmental air quality but could also become necessary to protect public health.
Answer: heart problems and air quality
The text mainly discusses the relationship between _ .

Article: A new study, led by scientists at the American Museum of Natural History, shows that living sharks are actually quite advanced in evolutionary terms, despite having retained their basic "sharkiness" over millions of years. The research is published today in the journal Nature. "Sharks are traditionally thought to be one of the most primitive surviving jawed vertebrates . And most textbooks in schools today say that the internal jaw structures of modern sharks should look very similar to those in primitive shark-like fishes," said Alan Pradel, a postdoctoral researcher at the Museum and the lead author of the study. "But we've found _ is not the case. " The new study is based on an extremely well-preserved shark fossil collected by Ohio University professors Royal Mapes and Gene Mapes in Arkansas, where an ocean basin once was home to a diverse marine ecosystem. The fossilized skull of the new species, named Ozarcus mapesae. The heads of all fishes -- sharks included -- are segmented into the jaws and a series of arches that support the jaw and the gills . These arches are thought to have given rise to jaws early in the tree of life. Because shark skeletons are made of cartilage , not bone, their fossils are very fragile and are usually found in flattened parts, making it impossible to study the shape of these internal structures. But the Ozarcus mapesae specimen was preserved in a nearly three-dimensional state, giving researchers a rare glimpse at the organization of the arches in a prehistoric animal. "This beautiful fossil offers one of the first complete looks at all of the gill arches and associated structures in an early shark. There are other shark fossils like this in existence, but this is the oldest one in which you can see everything," said John Maisey, a curator in the Museum's Division of Paleontology and one of the authors on the study. "There's enough depth in this fossil to allow us to scan it and digitally dissect out the cartilage skeleton." Working with scientists at the European Synchrotron, the ESRF, Pradel imaged the specimen with high-resolution x-rays to get a detailed view of each individual arch shape and organization. "We discovered that the arrangement of the arches is not like anything you'd see in a modern shark or shark-like fish," said Pradel. "Instead, the arrangement is fundamentally the same as bony fishes." The authors say it's not unexpected that sharks -- which have existed for about 420 million years -- would undergo evolution of these structures. But the new work, especially when considered alongside other recent developments about early jawed vertebrates, has significant implications for the future of evolutionary studies of this group. "Bony fishes might have more to tell us about our first jawed ancestors than do living sharks," Maisey said.
Answer: their fossils are found in a nearly three-dimensional state
It is hard to study the internal jaw structures of ancient sharks because _ .