Can dolphins talk ? Maybe they can't talk with words ,but they can talk with sounds . They show their feelings with sounds . Dolphins travel in group . We call a group of them a "school ". They don't study , but they travel together. Dolphins talk to other dolphins in the school .They give information . They tell other dolphins when they are happy or sad or afraid . They say "welcome "when a dolphin comes back to the school . They talk when they play . They make a few sounds above water . They make many more sounds under water . People can hear these sounds because they are very high . Sometimes people catch dolphins for large aquariums . People can watch the dolphins in a show . Dolphins don't like to be in the aquarium , being away from their school . They are sad and lonely if they do so . There are many stories about dolphins . They help people . Sometimes they save someone's life . Many people believe that dolphins can bring good luck . Dolphins show their feelings with _ . A) pictures B) words C) waves D) sounds
D

Can you imagine a classroom without one thing that has long been considered a necessary part? No notebooks, no textbooks, no test papers. Nor are there any pencils or pens, which always seem to run out of ink at the _ moment. A "Paperless classroom" is what more and more schools are trying to realize. Students don't do any handwriting in this class. Instead, they use hand-sized or specially-designed computers. The teacher downloads texts from Internet libraries and sends them to every student's personal computer. Having computers also means that students can use the Web. They can look up information on any subject they're studying, from maths to social science. A high school teacher, Judy Herrel in Florida, US, described how her class used the Web. "Using a book that's three or four years old is impossible," she said. A paperless classroom is a big step towards reducing the waste of paper. "Think about the money and trees we could save with the computers," she said. But, with all this technology, there's always a risk that the machines will break down. So, in case of a power failure or a technical problem, paper textbooks should still be widely available for these students. You are sure to find _ in a paperless classroom. A) pens B) computers C) test papers D) notebooks
B

One day, a raven happened to fly past a lake. Looking at the lake, he saw the most beautiful animal he had ever seen. It was a swan and its feathers were as white as snow. The swan was playing with other birds happily, talking and dancing. And it seemed that the other birds all liked to stay with _ When he looked at his own feathers, they were as black as coal. The raven was very angry with the swan. "How can the swan have such wonderful feathers?" said the raven. What should he do with his feathers? He thought it over and over. Then, the raven decided that he also wanted to have white feathers like the swan's. From that day on, the raven began to live like the swan. He moved his home from the woods to the lake. He also started to eat water plants like the swan. He tried his best to talk and dance with the other birds. The most important was that each day, the raven would wash his feathers, hoping that they would turn white. Even he went to the nearby rivers and ponds to wash his feathers because he thought the water in the lakes was not enough for him to wash them. But no matter how hard he washed his feathers, they remained black. As he ate only water plants, he soon grew thinner and thinner. Not many days later, the raven died. Why did the raven want to live like the swan? A) He wanted to make friends with the swan B) He wanted to see the swan's white feathers C) He wanted to eat water plants D) He wanted to become a swan
D