In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Article: Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity . In very cold climates, there is a constant danger of developing hypothermia , which is a life threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0degC. However, differences in persons and even the time of day can cause it to be as much as 6degC higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4degC. Below 29.4degC, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6degC. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7degC. In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7degC. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.
Question: Why can humans keep stable body temperatures in different seasons?
Options: (A) Because their bodies are unusually efficient. (B) Because they experience different climates. (C) Because they can adjust to cultural patterns and technologies. (D) Because they have internal temperature regulating systems.
D

Article: No matter where you travel in Asia, you'll find yourself faced with a new culture. You can start your Asian exploration by visiting some of these attractive cities first. Beijing, China Beijing is the second largest city in China and serves as the capital. The city is so old, in fact, that almost every building has some sort of cultural or historic features -- no matter how small. Getting around the city you'll find yourself faced with amazing temples , the largest palaces in the world, and many works of art that leave you breathless. Siem Reap, Cambodia Siem Reap is the capital city of Siem Reap Province in northwestern Cambodia. Siem Reap has a lot of French and Chinese-style architectures. In the city, there are traditional dance performances, silk farms, fishing villages and a bird sanctuary near the Tonle Sap Lake. Siem Reap today, being a popular tourist attraction , has a large number of hotels and restaurants. Kathmandu, Nepal Situated in the heart of the Himalayans, Kathmandu, the largest city and capital of Nepal, is considered to be one of the most outstanding cities in the world today. The shopping districts are world famous and the hotels in Kathmandu are among the most comfortable in the world. Kyoto, Japan The city of Kyoto served as the capital of Japan from 794 to 1868. No longer the capital, it is known for being the seventh largest city in Japan. Kyoto was destroyed throughout history by fires and war. But now the city is home to more than 1.4 million people, and it presents a modern face to the rest of the world. Every city throughout Asia has a story of its own. It's up to you to explore them all and find out exactly what each one has to offer. Enjoy!
Question: If you want to visit the biggest place where ancient emperors lived in the world, you can go to _ .
Options: (A) Beijing (B) Siem Reap (C) Kathmandu (D) Kyoto
A

Article: How many coins have you got in your pocket right now? Three? Two? or One? With a phonecard you can make up to 200 calls without any change at all. 1. _ Go to a telephone box marked "Phonecard". Put in your card to start, make your call and when you have finished, a screen tells you how much is left on your card. It costs no extra for the cards, and the calls cost 10p per unit, the same as any other pay-phone call. You can buy them in units of 10, 20, 40, 100 or 200. 2. _ Near each phonecard place you will find a shop where you can buy one. They're at bus, train and city tube stations. At many universities, hospitals and clubs, restaurants and gas stations on the highway and shopping centers. At airports and seaports. 3. _ Most broken payphones are like that because they've been damaged. There are no coins in a cardphone to excite thieves' interest in it. So you're not probably to find a broken one. Get a phonecard yourself and try it out. Or get a bigger wallet.
Question: The passage is most probably _ .
Options: (A) a warning (B) a notice (C) an advertisement (D) an announcement
C