阅读下面的文本, 从A、B、C、D四个选项中选出最佳选项。

    My friend Bob has a large police dog named Jack. Every Sunday afternoon, Bob and Jack have a walk in the park near their home. Jack likes these walks very much.

    On a cold Sunday afternoon, I go to Bob's home. Bob is happy to see me. At first Jack is happy too. Bob and I talk for a long time. Jack plays with a ball in the room for some time. Then he sits down in front of me and looks at me. I go on talking with Bob. Just at that time, Jack takes my hat and runs out of the room. I go after him to get my hat back. Suddenly, I know what Jack wants to do.

What a clever dog!

    On Nov.18th,1908,three men went up in a balloon（气球）.They started early in London. The headman was Augusta Gaudron, and the other two men were Tannar and Maitland. They had a big balloon and they were ready for a long way.

    Soon they heard the sea. They were carrying the usual rope（绳子）,and it was hanging down from the basket of the balloon. At the end of the rope they had tied a metal box. This could hold water, or it could be empty. So they were able to change its weight. It was for use over the sea. They were also carrying some bags of sand.

    After the sun rose, the balloon went higher. It went up to 3,000 meters, and the air was very cold. The water in the balloon became ice. Snow fell past the men's basket, and they could see more snow on the ground. The men tried to throw out some more sand; but it was hard. They tried to break the icy sand with their knives, but it was not easy. The work was slow and they were still falling, so they had to drop some whole bags of sand. One of them fell on an icy lake and made a black hole in the ice.

    At last they pulled the box into the basket. It was still snowing, so they climbed to get away from the snow. They rose to 5,100 metres! Everything became icy. They were so cold that they decided to land. They came down in Poland heavily but safely. They had travelled 1, 797 kilometers from London!

    Ryan's life was nearly perfect. He had lots of friends on his block. They walked to school together every day, and after school they always had time to play.

    Ryan did have one problem. It was his two-year-old sister, Allie. She was too small to play ball games. She couldn't climb trees yet.  Ryan and his friends didn't want her around.

    Ryan tried asking his mum to keep Allie at home. "Why does my sister have to come along?" he asked. "Troy's sister doesn't. Jimmy's sister doesn't. Why me?"

    Ryan's mother just laughed, "Troy's sister is only six months old, and Jimmy doesn't have a sister. Allie is nice, isn't she?"

    Today, Ryan was going to play baseball with his friends after school. Allie followed him as usual. The boys used to play football, but one of them broke a window at Mr Mcwhirter's house. Mr Mcwhirter wouldn't give them their ball back.

    The game got started. Allie sat on a stone nearby. Minutes later it was Jimmy's turn to hit the ball. Unluckily, it fell right into Mr Mcwhirter's yard.

    The boys ran over to Mr Mcwhirter's fence (栅栏). The ball was just out of reach.

    "None of us can fit through the fence." Jimmy said.

    The boys looked glum.

    Suddenly, Jimmy got an idea. "Allie, come over!" he called. "Would you like to get that ball for us?"

    Allie looked at the boys. Then she slipped through the fence, picked up the ball and came back out of the yard.

    "Wow," said Troy. "So quick! Thanks, Allie."

    "Nice job," said Jimmy.

    "Come on," said Ryan, suddenly proud of his kid sister. "I'll teach you how to swing the bat."

    It's 21:00 in Beijing now. Let's look at what the four students are doing.

Eric was standing in front of a large grey house in the countryside. He had just been dropped off by his mum, who left after telling him that he was going to spend the next twelve days there with no TV, no mobile phone and — worse of all — no computer.

Suddenly, a man appeared at the entrance of the house. When he saw Eric, he went up to him immediately. 'You must be Eric. Welcome to the camp,' said the man confidently. 'I'm Tony, the camp leader, but you will call me "Sir". Now tell me why you're here.'

Eric quickly replied, 'My mum made me come!' When Tony looked at him angrily and did not say anything, Eric realized his mistake and added, 'Sir!'

'And do you know why your mother sent you here?' asked Tony.

'She thinks I spend too much time online. Sir,' answered Eric. 'It's not just her opinion — it's the truth! Look at you — pale, unfit, and definitely not getting enough sleep. You're here because you think the virtual world is much better than the real world. But you're wrong! The real world has much more to offer. At the camp, you're going to go hiking, rowing, rock-climbing and stay outdoors most of the time,' promised Tony.

Eric's heart sank.

'But it's not going to be all fun and games,' Tony continued. 'We have rules here. If you break them, you'll get punished. But you won't simply get detention (课后留校), and you can forget about suspension (停学) — you'll never be sent home early! Instead, you'll clean the toilets, wash the dishes or do an extra hour of exercise!'

'Oh Mum,' sighed Eric. 'What have you got me into?'

Liu Wenwen started to learn suona at the age of three. Learning suona needed {#blank#}1{#/blank#} and hard work." In order not to influence (影响) neighbors, my parents took me to {#blank#}2{#/blank#} in a park around 4 am every day," said Liu. Her classmates always laughed at her. Because at that time, they {#blank#}3{#/blank#} suona as an art of the hillbilly(乡巴佬). Liu said she felt sad. But she didn't {#blank#}4{#/blank#} learning it. When she entered Shanghai Conservatory of Music, she{#blank#}5{#/blank#} with this instrument." The music played by Professor Liu, a top player, is amazing," she said.