What was discovered by accident? The answer is penicillin (青霉素). It kills germs. By killing germs, it saves lives. Suppose you are sick. You go to a doctor. She examines you. She says you have a “staph” infection (葡萄球菌感染). She gives you some medicine. You take it. The medicine knocks out the staph. Soon you are well. Before penicillin, this would not happen. Staph was almost sure death.

    Everyone wanted a medicine. Laboratories worked day and night. They grew the staph in small dishes. Then they tried to kill it. Nothing worked.

    The laboratory dishes had covers on them. They kept things from falling into dishes. Molds (霉菌) were a big worry. They are always in the air. You can't see them. They're too small. There are thousands of different molds. Molds can make an experiment (实验) fail. That's why dishes are covered.

    Dr. Alexander Fleming was working to kill the staph germ. He worked for years. One day he took a cover off a dish. He looked inside. There was a thick growth of staph germ. There was also some mold. Then he saw something strange. Where the mold was, there was no growth of staph. This is what Fleming probably thought. “By accident, I found a mold to kill the dreaded staph.”

    This is how penicillin was found. But here's the real miracle (奇迹). There are thousands of kinds of molds. But only one kind can kill staph. The mold must have fallen into the dish a few days before. The cover was probably off only a few seconds (秒). In those few seconds the right mold fell into the right dish. Another man might have thrown the dish away. But Fleming was very careful and smart. He understood what the mold did. How lucky the humans were!

根据短文内容，选择最佳答案

    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."

    Jack walked up to Sue and said, “Hello, how are you? May I sit and talk with you for a moment?” “Of course, please sit down,” Sue said. Jack sat down next to Sue on the bench (板凳), and they talked quietly together. The dog continued to look up at Sue, as if（似乎) waiting to be given some food.

    “That's a nice dog, isn't he?” Jack said, pointing at the animal.

    “Yes, he is. He's handsome. He's strong and healthy.”

    “And hungry,” Jack said. “He hasn't taken his eyes off you. He thinks you've got some food for him.”

    “That's true,” Sue said. “But I haven't.”

    They both laughed and then Jack said, “Does your dog bite（咬）anyone?”

    “No, ”Sue said, “ He's never bitten（咬）anyone. He's always gentle and friendly.”

    Hearing this, Jack decided to hold out his hand and touched the animal's head. Suddenly it jumped up and bit him.

    “Hey!” Jack shouted. “You said your dog didn't bite.”

    Sue answered in surprise, “Yeah, I did. But this is not my dog. My dog is at home.”

    I once knew a man who was rich in his love for birds, and in their love for him. He lived in a grove full of all kinds of trees. He had no wife or children in his home. He was an old man with blue and kind eyes, and a voice that the birds loved.

    While he was at work in the grove, the birds came close to pick up the worms(蠕虫) in the fresh earth he dug up. At first, they kept their distance from him, but they soon found he was a kind man, and would not hurt them, but liked to have them near him.

    They knew this by his kind eyes and voice, which tell what is in the heart. So, day by day their faith in his love grew in them.

    All the birds of the grove were soon his fast friends. They were on the watch for him, and would fly down from the green tree tops to greet

him with their chirp(叽叽喳喳叫).

    When he had no work to do, he took bread with him, and dropped the pieces on the ground. Down they would dart(俯冲) on his head and feet to catch them as they fell from his hand.

    He showed me how they loved him. He put a piece of bread in his mouth, with one end of it out of his lips. Down they came like bees at a flower, and flew off with it piece by piece.

    When they thought he slept too long in the morning, they would fly in and _______.

    They went with him to church, and while he sang his hymns in it, they sat in the trees, and sang their praises.

    So the love and trust of birds were a joy to the old man all his life long.

Over the past 6 years, Zhang Chaofan has given away 1.35 million yuan and raised 5.2 million yuan from the public to help more than 400 people with health problems—including teachers with cancer (癌症) and disabled children in poor families—learn traditional Chinese culture.

Zhang, 29, was born without a left arm in Changchun, Jilin, but her hard work to become stronger has encouraged many people. She was chosen along with 67 other honorees (领奖人) to receive the Eighth National Ethical Role Model award (第八届全国道德模范提名奖) at the Great Hall of the People in Beijing on November 5th, 2021.

In 2015, Zhang set up a handwriting and painting school in Changchun. When she found that some parents were unable to pay for their children's education, she made the lessons free and began providing 300, 000yuan every year to help them.

In early 2020, her school was made to suspend all courses because of COVID-19 (新冠肺炎) but it didn't stop her from helping the poor families. She raised more than 8.9 millionyuan and gave them away to Hubei hospitals.

"Women in the new times should have the courage to create value and also have a sense of social duty," she said. "It is my great honor to be chosen as a model. This will become a driving force for me to move ahead and keep helping the poor and the disabled."

Sam is my friend and he is a {#blank#}1{#/blank#}(法国的) boy. He can speak English very well. I heard from

him yesterday. He told me lots of {#blank#}2{#/blank#}(绝妙的) things in the email. He visited the US with his family last week. They {#blank#}3{#/blank#}(花费) four days in New York and three days in Los Angeles. In New York, they went to the {#blank#}4{#/blank#}(举世闻名的)Metropolitan Museum of Art. They took lots of {#blank#}5{#/blank#}(照片) there, In Los Angeles, they went to Disneyland first. Sam was {#blank#}6{#/blank#}(兴奋的) to see his favourite Mickey Mouse. The next day they {#blank#}7{#/blank#} (放松) in the hotel during the daytime. In the evening, they went for a walk when all the {#blank#}8{#/blank#}(灯) were on in the street. On the last day, they went to the Hollywood. They {#blank#}9{#/blank#}(遇到) some movie stars there. After that they went home{#blank#}10{#/blank#} (乘)plane. It was a really fantastic trip.