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.
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Question: Article: Ladybirds didn't have black spots on their backs at first. Then a storm broke out, and their famous guide, Caius Insectus, disappeared into the flood , and the few ladybirds who survived had to choose a new leader to guide them out of trouble. They decided that their new leader would be the first ladybird to successfully travel south to the Great Lake and return to describe it. Many young ladybirds moved off immediately into this adventure. One by one they returned and told of how beautiful the southern lake was at that time of year, with its clear waters and flowers. However, the last of the ladybirds was late in getting back. He hadn't managed to reach the lake. Everyone criticized him, and they prepared to continue their journey the next day. Following their new guide, they spent a morning walking northwards until they reached some tall thick grassland, where they stopped. There were no clear waters or flowers in front of them. The heavy rain had turned the place into a huge green puddle . Everyone understood what had happened. When the ladybirds had gone out looking for the lake, they had gone in the wrong direction. Now they could see that, except that one late ladybird, they had lied in order to get what they wanted. And so, the late little ladybird was made the Great Guide. They also decided that every time one of them was discovered lying they would paint a black spot on that ladybird's back. From then on, when a ladybird looks at another's back, it can tell whether that ladybird can be trusted.
Question: Why did the ladybirds decide to choose a new guide?
Options: (A) They lost their way in the storm. (B) They weren't satisfied with Caius Insectus. (C) They needed someone to lead them out of danger. (D) They needed someone to help prepare for the storm.

Answer: C

Question: Article: It's nine o'clock on a Tuesday night.You are trying to finish your maths assignment. You have only two problems left to go.Almost done!You are looking forward to a nice snack and your favorite TV show.You read the next problem and groan.You don,t have a clue how to do it .You may check your notes from class .Or you may try reading your text-book .But the problem might as well be written in a foreign language. Does this sound familiar? Most people who have taken any kind of maths class have had this experience.What do you do when you get stuck? Perhaps you call a friend.Or you ask a family member for help.But what if it's late at night? Years ago there were very few ways to get help if you were stuck on a maths problem. Maths is different from other school subjects.You often cannot find what to do in a book.A dictionary or even an encyclopedia probably won't help you.You need someone to show you the steps.Learning most kinds of maths is something like learning to play a musical instrument.You need a coach to show you what to do. In many areas there are homework telephone lines.These hot lines have volunteers.They can help you do homework in all subjects.A maths volunteer can explain the steps in a maths problem that has you stumped* Today you can also get help on the Internet.There are several homework help programs and Web pages .In some,you leave your question on a message board.Or you write it in an e-mail note.In other maths-help programs there are live volunteer teachers.You can wait for a real maths teacher to help you do the problem.
Question: This passage is mostly concerned with _ .
Options: (A) why maths is difficult to do (B) ways of getting help with maths homework (C) using reference books to do maths homework (D) using a computer to do maths

Answer: B

Question: Article: Experts have put forward detailed plans for a tunnel to connect Taiwan with the Chinese mainland. The shortest proposed route would be 126 kilometers more than twice the length of the English Channel Tunnel. And the longest proposed route would be 207 kilometers. A recent conference in Xiamen, Fujian Province brought together more than 70 experts. The event was co-sponsored by universities from Taiwan and the Chinese mainland. Fujian is the province where both proposed routes would begin. There is direct passenger access between the mainland and Taiwan by air and sea at the moment. Experts say that it is better to start research sooner rather than later, although there is a lack of government funding . There are no technical problems to build a Taiwan tunnel. But it will require an improved political relationship across the Straits . A professor of Tsinghua University said, "A special feature of huge projects is that the period of preparation is longer than the period of construction." For example, he said, the English Channel Tunnel took 14 years of planning and had been discussed for two centuries. And preparations for the huge Three Gorges Dam on the Yangtze River began in the 1950s. The Xiamen conference focused on the longest southern route, which would pass Jinmen and Penghu. The first stage of the new project could be a bridge to cross the five kilometers between Xiamen and Jinmen. This would mean that travelling from Xiamen to Jinmen by car would only take five minutes. The longest tunnel now being planned anywhere in the world is the 54-kilometer land tunnel to link Lyon in France with Turin in Italy. The tunnel will not be completed until 2015-2020.
Question: Which is the longest tunnel in the world at present?
Options: (A) The tunnel between Lyon and Turin. (B) The English Channel Tunnel. (C) The Taiwan Straits tunnel. (D) The passage doesn't mention it.

Answer:
D