Read the following article and select the best answer. Article: On the night of July 6, 1943, a plane took off from an Air Force base in England to stop German fighters over the English Channel. Piloting the plane was Captain Thomas Nash. Looking westward, Nash saw twelve orange lights in a row, moving at a very high rate of speed. Thinking they might be a new German weapon, he swung the plane around and headed directly for the lights, but they disappeared. Captain Nash may have been the first to see such orange lights but he wasn't the last. His experience was repeated many times by pilots during World War II both in England and Far East. What were they? No one knows for sure, but there is an interesting theory to explain them. According to this theory, the orange lights are space animals---animals specially adapted to life in the upper atmosphere just as some living things are adapted to life at the bottom of the sea. These space animals, the theory says, live so far up in the atmosphere that they are not in sight from the earth. They feed partly on the air and partly on energy from the sunlight. Being almost pure energy themselves, their body shine at night. During the day, however, they are invisible. Before World War II, continues the theory, there was little radiated energy on the earth's surface. Then came the development of rockets, nuclear power stations and something like that. The space animals are attracted to these kinds of energy of food. At night when there is no energy from the sunlight, they come down into the lower levels in search of a meal. They may even float into the range of human eyesight. This explains the fact that they have been sighted many times from the earth since 1943. Question: The main idea of this passage is that _ . - Captain Nash saw twelve orange lights traveling with great speedks5u - Captain Nash may have been the first to see lights in space - the orange lights are space animals according to a theory - the secret of nature can be explained sooner or later
the orange lights are space animals according to a theory

Read the following article and select the best answer. Article: If you really want to go green, here's good news: eating green is good for you. The very foods with a high carbon cost---meat, pork, dairy products, processed snacks---also tend to be filled with fat and calories. A green diet would be mostly vegetables and fruits, whole grains, fish and lean meats like chicken---a diet that's eco- and waistline-friendly. Eating green can be healthier and beneficial to the climate. It may be hard to believe that a meal at McDonald's produces more carbon than your trip to a far away place. More than 37% of the world's land is used for agriculture, much of which was once forested. Deforestation is a major source of carbon. The fertilizer and machinery needed on a modern farm also have a large carbon footprint, as does the network of ships and trucks that brings the food from the farm to your plate. The most efficient way to reduce the carbon footprint of your menu is to eat less meat, especially beef. Raising cattle takes a lot more energy than growing the equivalent amount of grains, fruits or vegetables. What's more, the majority of cattle in the U.S. are fed on grain and loads of it---670 million tons in 2002---and the fertilizer used to feed that creates separate environmental problems. Focus on eating lower on the food chain, with more plants and fruits and less meat and dairy. It's simple. We can change today what goes into our bodies for the health of our planet and ourselves. Question: In the author's opinion, the most efficient way to reduce carbon is to _ . - eat more vegetables than meat - stop raising the cattle - plant more grains - use less fertilizer
eat more vegetables than meat

Read the following article and select the best answer. Article: What a Scientist Is Like If you were asked to imagine a scientist, what image would come to your mind? The common idea that most kids from kindergarten through college have of a scientist is a man wearing a white lab coat with messy hair, big glasses, and several glass cups of mysterious color1ful liquids giving off clouds of smoke. As for adults, the majority view scientists as strange people who spend 100 hours a week slaving away in a lonely laboratory. However, the reality is quite different. Recently I've had a chance to take part in a scientific experience far from my laboratory and into Costa Rica. It supports a huge amount of wildlife due to its geographical placement between North and South America. It is home to more than 500,000 species ,which represents nearly 4% of the total species worldwide! First we worked alongside conservationists to preserve wildlife at a leatherback turtle ( )rescue center. We helped the volunteers preserve turtle populations by removing rubbish from the shoreline to create a safe environment for turtle eggs to come out. After that we stayed at Mount Arenal where we studied seismic activity relating to earthquakes. During our stay at Arenal, we rode over the mountainous areas and took a long walk through the rainforest. After reaching the top, we went down and through waterfalls to the beautiful valley below! On the last day we got a hands-on introduction to rocket science where we learned about new rocket technology that will be used on the international space station. During my Costa Rica experience, I know that being a scientist doesn't mean working in a lab all day and night. A scientist is one who loves learning and getting a better understanding of the world from helping preserve wild-life, learning about earthquakes or inventing rockets. I think that schools should really stress that science is so much more than wearing a lab coat and mixing chemicals. Kids need to be aware of the excitement and adventures science can bring! Question: Why does the author write this passage? - To encourage kids to study science. - To tell the story of traveling in Costa Rica. - To expect more people to travel in Costa Rica. - To share the secrets behind science phenomena.
To encourage kids to study science.