Read this excerpt from "Herd about the Flu.”The flu shot helps prevent huge numbers of infections. Even when it doesn’t fully prevent infection in every person, the shot makes any flu infection less serious. On a global scale, the vaccine can reduce the number of infections only if most people in the community take it. That’s because vaccines need to reach enough people to achieve a "herd immunity,” the level of immunity needed to prevent the virus from spreading. If too few people get the vaccine, the people who receive it may not be well protected against infection.So the next time you are at the drugstore, and you see No Flu Shots Available, think about the reasons behind it. Drug makers are scared to make too many flu shots because they could lose too much money. They then make fewer flu shots and the effect of the flu shots becomes weaker because not enough people take it. People become more reluctant to take the flu shot since they don’t think it will fully work. The demand goes down further and the flu companies make even fewer shots the next year.This could continue until the community changes its mind and we all get the flu shot. "That is a community responsibility," says the president of Merck, one of the two remaining flu vaccine manufacturers.
An old photo of men playing football without pads or helmets.

Read this excerpt from “Herd about the Flu .”We can’t easily predict what people will do. Some people oppose taking any vaccine. Others don’t get around to it. Finally, some people may not take it because they know it doesn’t always work. Unlike vaccines against measles, polio, or smallpox, today’s flu shot doesn’t give full immunity, or resistance, to the flu.What is the point of a flu shot if it doesn’t work, and why doesn’t it always work? The flu is complex and strains change quickly. People need to be vaccinated with a new batch of vaccine every year. Vaccines must be produced long before the actual flu virus, or the strain of virus, starts to work its way through the community. Some years, scientists do a better job of predicting which strains will be common that year. Sometimes, even if the scientists predict the right strains, the vaccine may not create a strong immune response.
Read this excerpt from "Mad Cow, Furious Farmer.”The disease was first detected in England in 1986, though some scientists think the very first cases started at least ten years before. Cows usually eat only grass and other plants, but farmers had been feeding them a meat and bone mixture that made the cows plumper. But somehow, at least one batch of the mixture had become contaminated with what was then an unknown killer: a prion.By 1993, British farmers were reporting up to one thousand new cases of BSE a week. Governments all around the world reacted by increasing testing for the disease and not allowing any cows to be eaten if they were at risk of having the disease. As sheep can also get a prion disease called scrapie, they were tested as well. Farmers were angry that they were losing their livestock, and nobody knew how to protect cows and people from the disease.Consumers were also in a panic when they learned about BSE, and for a very good reason: prions are infectious. If you eat a prion from a "mad cow” or sheep, you are at risk for developing a human version of BSE. The public felt betrayed that their governments had underreacted to the problem or covered it up.Eventually, in 1997, governments began to ban farmers from feeding their livestock high-risk meat and bone mixtures. With that ban, the epidemic quickly peaked, and by 2010 had largely disappeared. Over the years, half a million cows and two hundred people had been killed by prions.
Read this excerpt from "Heads Up on Sports Safety.”The dangers to your head depend on the sport, but some general principles guide helmet design. First, the helmet needs to be as cool and lightweight and comfortable as possible. Second, the helmet needs to be hard enough and fit well enough to protect the skull and brain. For some athletes, like hockey goalies or baseball catchers, the helmet also needs to protect the face from fast pucks or balls. Third, it must not prevent the wearer from seeing or hearing. Fourth, it cannot cause more injuries than it prevents.It turns out that the way to address many of these concerns is to use hard but flexible, light, strong materials on the outside and soft materials on the inside. Scientists create new plastics all the time, but sometimes the best designs come from using old materials in new ways. One recent design makes the shell of helmets out of Kevlar, the same kind of light plastic used in bulletproof vests.
Read this excerpt from "Mad Cow, Furious Farmer” and consider the resource provided at the end of the passage.Eventually, in 1997, governments began to ban farmers from feeding their livestock high-risk meat and bone mixtures. With that ban, the epidemic quickly peaked, and by 2010 had largely disappeared. Over the years, half a million cows and two hundred people had been killed by prions.In the end, the BSE epidemic was a watershed moment, or turning point, in public health. Citizens were enraged at their governments for having kept prions a secret. Governments, who had lost the public trust, struggled to find the best way to communicate health risks without creating unnecessary panic. Ainsworth, Claire, and Damian Carrington. "BSE disaster: the history.” 25 October, 2000. http://www.newscientist.com/article/dn91-bse-disaster-the-history.html#.UdS7vW3Ty7A.
Read this excerpt from “Heads Up on Sports Safety.”Before modern helmets, in 1904, the Chicago Tribune reported 18 football deaths and 159 serious injuries—in that one year alone. Because the game was lawless and lacking in safety equipment, football was a brutal, deadly sport.
Look at the graphic and read the excerpt from Chapter Four of Windows to the Universe: Revolutions in Astronomy.One of the most significant challenges in JWST's design was ensuring the sunshield could unfold correctly after launch. It had to be folded precisely to fit into the spacecraft and then unfurl perfectly once in space—like a massive piece of origami. The success of this deployment was critical to the mission. When flight control confirmed it had unfolded correctly, the entire control room erupted in cheers!Which conclusion can best be drawn about JWST’s sunshield?

A writer can use numbering to
A supporting text
Which is a problem-solution signal word?
Read the excerpt from Chapter Three of Windows to the Universe: Revolutions in Astronomy.The construction and launch of Hubble faced many setbacks. Funding was a constant issue, with NASA and Congress debating the budget. One key figure, Dr. Nancy Grace Roman, played a vital role in securing funding and keeping the project on track. Dubbed the "Mother of Hubble," Dr. Roman was NASA's first Chief of Astronomy and a strong advocate for space-based telescopes. Without her dedication, Hubble might never have left the ground.
Which information would most likely be presented in graph form?
When an informational text is organized chronologically, what is it most likely about?
Which statement best describes the purpose of an index?
Read this excerpt from When Birds Get Flu and Cows Go Mad! How Safe Are We?.24/7: How did you become interested in disease control?DR. SCOTT DOWELL: My father was a doctor. I remember being very young and traveling with him and my mother to Haiti. He treated patients there who were suffering from different viruses.
Read Chapter Two of Windows to the Universe: Revolutions in Astronomy.
Read this excerpt from "Heads Up on Sports Safety."Your neck can also get hurt while playing football, so many helmet designers are using materials that prevent neck injuries. One common injury is whiplash, which is a sudden hit to the head that moves the neck very quickly. Neck padding can help, but materials that prevent the head from turning can decrease athletic performance. One alternative is to use a thermoplastic material that responds differently to different kinds of pressure. This material is soft when moved or pressed slowly but stiffens into a hard version of its shape when hit quickly. It has been used in bulletproof vests for at least a decade.
Read this table of contents.CONTENTSPreface vIntroduction 15Culinary Curiosities 32Invitations to Dinner 36Carving 43Friendly Advice to Cooks 45Table of Weights, etc. 65RUDIMENTS OF COOKERY.Boiling 66Baking 72Roasting 74Frying 80Broiling 82Vegetables 83Fish 86Fish Sauces 88Broths and Soups 89Gravies and Sauces 100Made Dishes 106
Did you find these answers helpful?