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.

[EX Q]: Article: Many people say dolphins are very intelligent. They seem to be able think, understand, and learn things quickly. But they are smart like humans or more like cats or dogs? Dolphins use their brains differently from people. But scientists say dolphin intelligence and human intelligence are alike in some ways. How? FACT 1: Talk to Me Like humans, every dolphin has its own "name". The name is a special whistle . Each dolphin chooses a specific whistle for itself, usually by its first birthday. Actually, scientists think dolphins, like people, "talk" to each other about a lot of things, such as their age, their feelings, or finding food. And, like humans dolphins use a system of sounds and body language to communicate. But understanding their conversations is not easy for humans. No one "speaks dolphin" yet, but some scientists are trying to learn. FACT 2: Let's Play Dolphins are also social animals. They live in groups called pods, and they often join others from different pods to play games and have fun ---just like people. In fact, playing together is something only intelligent animals do. FACT 3: Fishermen's Helpers Dolphins and humans are similar in another way: both make plans to get something they want. In the sea of southern Brazil, for example, dolphins use a interesting strategy to get food. When fish are near a boat, dolphins signal to the fishermen to put their nets in the water. Using this method, the men can catch a lot of fish. What is the advantage for the dolphins? Why do they assist the men? The dolphins get to eat some of the fish.
Question: What is the text mainly about?
Options: (A) The comparison between dolphins and humans. (B) The relationship between dolphins and humans. (C) Different types of dolphins. (D) The habitual behavior of dolphins.
[EX A]: A

[EX Q]: Article: It is a reply to a letter written by Zhai Mingjun, a 16-year-old girl in the class. The two astronauts thank the student for her concerns and wish the class luck in their future studies. "I' m so happy that the two space men replied with a few encouraging words," said Zhai. Her letter was one of the 10 winning letters taken into space by Fei and Nie, who have succeeded in traveling space in the Sixth Shenzhou Spaceship. Zhai wrote the letter as if she were a younger sister of the astronauts. "As the single child in my family, I always hoped that I would have an elder brother that I could be proud of," Zhai said. "I thought that the astronauts would be lonely during such a long space trip. I hoped they would feel happy and warm when reading my letter." Many of Zhai' s classmates also wrote their words of encouragement and admiration to the astronauts. "The letter to the astronauts made us believe that we can also be part of the manned space programme," said Zhao Dongxu. All the students have high expectations for China' s future space programme. "I heard that Snoopy is the mascot for US astronauts. I hope I can design a mascot for our heroes," said Liu Mengjie, 16. "A physics class taught by astronauts in outer space would be very interesting. I want to be the astronaut who teaches students about zero gravity with my head upside down in the spaceship," said Han Yinan. Many students think that the manned space program is still far away from them. But they feel proud that ordinary students could participate in such a great scientific achievement and hope there will be more possibilities to take part.
Question: The best title of this passage can be _ .
Options: (A) The mascot (B) A reply from space (C) The manned space program (D) The letter to the astronauts
[EX A]: B

[EX Q]: Article: When my son was just learning to talk, I carried him around the house in my arms and pointed out things to him. "Look, David, a clock. "He'd smile and point as I did and say "clock". David was quick at connecting the shape of things to their words. When my son was about four years old, I walked with him to the backyard. I knew that there was an ant colony under one of the slate stones in the walkway near the shed, so I said to David, "Come on. I want to show you something. " As I showed David the ants that were crawling around the slate stone, he crouched down on his legs and looked with great intensity at the ants. For days after that, David wanted to look under every rock in the garden, and we often found worms, ants and so on. I recognized that David loved to look at things closely and observe how things moved, and so I continued to point things out to him as he grew older: planes, cars, shells etc. . David was a keen observer, and I just gave him the suggestions as to where to look. Today David is a medical doctor at Columbia University Center. I did not know that David would someday be a doctor, someone who has to pay close attention to what he sees, and yet I felt compelled when he was a boy to encourage his enthusiasm for observation. That is what teachers and parents do: encourage a child's enthusiasm for a particular interest: music, swimming, art, reading. And we provide tools for the children. If a child likes to draw, give him brushes, pens, and paper. If a girl likes to tap on the table top, give her a drum. If a child wants to sing, give him a microphone and a Frank Sinatra recording.
Question: The author wrote the passage to .
Options: (A) recall the happy times he spent with his son (B) tell us that children are full of curiosity (C) tell us how to let children love nature (D) advise us to develop children's interest or talent
[EX A]:
D