Read the following article and select the best answer. Article: As the population grows and temperatures rise, it will become more difficult to grow enough food for everyone. So, scientists are exploring the planet for plants that do not need as much water as today's crops. The Mojave Desert in the US state of California is home to some of these plants. Scientist Heather Rose Kates of the University of Florida is in that desert. She is searching along roads for a plant called coyote melon which is a kind of squash .Coyote melon may not taste good, but it can be grown in places that have little rainfall. The desert where it grows gets just 15 to 20 centimeters of rain per year, or less. Other kinds of squash need at least two and a half centimeters per week to grow. Scientists are considering combining wild coyote melon with regular squash to see if they can make a tasty vegetable that doesn't need as much water to grow. That could be useful on a planet growing warmer and more crowded every day. Andy Jarvis works at the International Center for Tropical Agriculture. He says farmers will need to produce 50 to 70 percent more food by 2050 to feed the world. So, he says, researchers are studying the wild versions of farm-grown crops. But he says there is a problem. He says many wild versions of farmed plants are disappearing. He says they are threatened and scientists have not collected their seeds for future use. Scientist Kates is part of an international effort to gather these plants and save their seeds while it is still possible. Workers are collecting wild potatoes in Argentina and wild peppers in Para-guav. The plants and seeds will be sent for storage to the Global Seed Vault in Norwav and at Kew gardens in Britain. Ms Kates spends most of her time in a laboratory. She says gathering plants has helped her understand more about them. Question: We can know Andy Jarvis _ . - is searching for the coyote melon - is in charge of the research of agriculture - feels somewhat pessimistic about the scientists' research - thinks producing more food to feed the world is easy
feels somewhat pessimistic about the scientists' research

Read the following article and select the best answer. Article: Animals are considered to be endangered if the species is close to extinction throughout all or most of its environment. Animals become endangered for a variety of reasons. Some animals become endangered when their habitats contain resources for humans. For example, commercial forest cutting in the Amazon Rainforest has seriously reduced the population of many animal species and lead to the extinction of other groups. Land itself is an important resource to humans since it provides us with living space, and when people replace animal habitats with human habitats, it can lead to larger loss of natural species. Commercial and industrial operations may reduce land or water for animals and pollute their environment. Due to water pollution, the baiji, a fresh water dolphin native to China, was declared extinct, meaning it's unlikely the population can recover. Even noise pollution from human activities can lead to the disorder of animal behavior. Another cause that makes animals become endangered is over-fishing or over-hunting. Over-hunting whales led to near extinction of many species of whales. The introduction of a non-native species to a habitat may make animals become endangered. The native species may not defend against a new one, and the effects can be dangerous. In Australia, the introduction of the common house cat led to the extinction of the red-fronted parakeet and has seriously damaged the populations of several small animals. Introduced species can also bring new diseases with them. As a result, animals become endangered. Native animals may not have the power to fight against non-native diseases, and population levels can suffer. Another cause of disease is human-introduced chemicals. The use of DDT is believed to be one of the leading causes in driving the California Condor to near extinction. When animals become endangered, the entire food chain can be affected. For example, in 2008 disease seriously harmed the honeybee, which is largely responsible for pollinating plants, including many fruits... Question: Which of the following examples shows that environmental pollution may cause species endangerment? - The extinction of the whales. - The extinction of the red-fronted parakeet. - The decreasing population of the dolphin. - The effect of the honeybee on the human diet.
The decreasing population of the dolphin.

Q: Read the following article and select the best answer. Article: Monday - 9:00 p.m. PT (11:00 p.m. CT) (Midnight ET) I love to answer questions about children's health. Some questions and their answers become articles, FAQ's, Updates, Fast Facts, Top Tips, or Guidelines here on the site. I answer others in real time during chat. Either way, here is how to submit a question - I am available live, for one hour, every weekday. No appointments are necessary! All you have to do is log on to Chat and ask your question. In most cases, you'll get your answer right there! Some of the questions from chat are selected for me to write about in greater depth. Even if you don't have time to stay at chat, come for a moment, and send your question to the chat host to be considered for a future article. Please join me in chat, Monday - November 22, 2004 at 9:00 p.m. PT(11:00 p.m. CT) (Midnight ET) I will be in the chat room for one hour to answer your children's health questions. To ask your question please type a " ?" mark on the screen A host will call upon you when it is your turn to ask a question. Click here to chat Click here to learn more about chat Click here for a complete chat schedule Question: The chat with the writer on the screen _ . - lasts one hour - must be about children's health questions - has to be called on Monday - must go on in a room
A: must be about children's health questions

Read the following article and select the best answer. Article: Roger Conner is a modern-day Horatio Alger hero. Roger started out as an unpaid worker in a small flower shop. He has become the owner of a florist company whose sales are well over $100 000 a year. One day when Roger was only twelve, he stopped at a local flower shop. He asked the owner if he could work for him, without pay, in order to learn the business. Roger started working every day after school and on weekends. After two years on the job, he finally asked for a small salary. The owners told him he "wasn't good enough to be paid." So he quit, and found a paying job at another local flower shop. He worked hard there, but after six months they _ because business was slow. Not discouraged, Roger decided to do it alone and started his own flower store in a basement in his town. He started his business with only sixty-five dollars. He bought old refrigerators at garage sales and knocked the shelves out. This turned them into coolers for his fresh-cut flowers. His business grew rapidly as he built up a reputation for top quality and fine service. In 1977, Roger bought out the flower store where he had worked without pay for over two years. The people who said he "wasn't good enough to be paid" were astonished to find that they were being taken over by a teenager. He had plans to renovate the whole store. One of the reasons the owners sold out to Roger was that the store wasn't doing well. But after Roger took over ownership and redid the store, business started booming. In fact, business was so good that after one year, he celebrated by buying out the other store where he had worked. Roger then combined both stores and moved to a location in the center of his town. The new store has 2 000 square feet and seven employees. And he did it all before he reached the age of twenty. Question: From the passage, a "Horatio Alger hero" may be the kind of person who _ . - works hard in the flower business - was born into a rich family - starts out poor and becomes rich - becomes famous as a result of good luck
starts out poor and becomes rich