Q: On a hot summer day, ice-cold watermelons serve up a delicious treat. Sure, the rosy flesh   quenches your thirst  . But now there are more reasons than ever for people to reach for a slice of watermelon. Meet Dr Alison Edwards. She is a scientist at the Agricultural Research Service. Scientists are people who come up with new ideas called theories  . They usually do scientific research to test their new theories. That's how they find out if a new idea is a good one, or if the new idea will bring an even better idea. At her lab, Dr Edwards recently learned more about the secrets of why watermelons are good for you! Dr Edwards has known for a long time that watermelons have vitamin C. But recently she learned that watermelons also have lycopene  . It is something that gives tomatoes and watermelons their rosy red colour. What's so special about the lycopene in watermelons? Dr Edwards says that watermelons and tomatoes both have lots of lycopene. It seems that your body can use the lycopene from watermelons more easily than the lycopene from raw   tomatoes. In fact, the lycopene from tomatoes is more easily absorbed   inside your body once they have been cooked. How does a scientist usually test a theory? A) By practising it in daily life. B) By doing scientific research. C) By discussing it with other scientists. D) By looking into many scientific reports.
A: B


Q: Now, there is a new-type school in New York, which has no everyday lessons, no class teachers and even no school buildings. It is called "City-as-School". The name just means the city itself is the place where students learn their lessons. They are from the age of 15 to 18. The students choose areas of work which interest them. Then they help to do that work. One girl spends her week in a government office helping the public with problems like housing. Then she goes to help in a theatre for a day and she spends a week for first-year courses at college. Well, students have to pass Maths and science exams before they enter the "school". These subjects are not easy to provide in"City-as-School". Teachers watch the progress of the students. The success rate   is high. 80% of the students go to college after the "City-as-School". The students like the duty of their work. They have the sense of purpose. They know a lot about different kinds of work in the city. One of the students, Lizette Martinez, writes " I want to say that I do not know where I would be right now if I had never become part of City-as-School. Leaving my regular high school and going to City-as-School was the best decision I have ever made. The way the school works to get you to go out there and learn different fields instead of sitting in a classroom is wonderful. For all those who are in between school and dropping out, go to CAS and it will change your life forever." City-as-School High School is the nation's leading   external   learning or experiential   learning model for high school students. What do students do in"City-as-School"most of the time? A) They do whatever they like. B) They learn Maths and Science. C) They help with work in a certain area. D) They learn all the college courses.
A: C


Q: Sam was a-fifteen-year-old boy living with his little sister, Julie. Their parents had passed away long ago. Sam had taken care of Julie by himself. One day, Sam woke up at three in the morning as usual. When Julie was sleeping alone, Sam left their little house to send newspapers. When he found an old man sitting in front of their house, Sam was so surprised that he stopped to look at him closely. It was an icy  morning and he looked very cold. The poor old man didn't have anything to cover himself with. Sam went into his house to get the old man a blanket. However, there were no extra blankets, so Sam thought hard and took his father's coat. It was the only thing of his father's that he had left. Sam wrote a short note. "Sir, I found you sleeping in front of my house. This is my father's coat. I hope it fits you well." He put the note in a pocket of the coat, and covered the old man with the coat. Then he went to work. When he came back three hours later, both the man and the coat were gone. Sam thought that it was the best thing he could have done with his father's coat. That afternoon, Sam hurried home after school because Julie was at home alone. However, Julie and the old man were standing in front of the house, and Julie shouted to Sam, "Brother! He's our grandfather!" The grandfather smiled and said, "Sam. Thank you for giving me the coat and letting me know how good my grandson is. This coat was the one that I gave my son a long time ago!" Sam covered the old man with his father's coat because  _  . A) his father's coat fitted the old man well B) the coat was the only thing that his father had left C) he knew the old man was his grandfather then D) he had no extra blanket
A: D


Q: Most animals protect  their young until they are old enough to take care of themselves. A fish that swims in the rivers of South America protects its young in a very strange way. This fish, a kind of catfish, uses its mouth to keep its babies from danger . When this catfish lays  its eggs, it carries them in its mouth. From what we know, it does not eat during this time. After the eggs hatch , the fish swims with its young to protect them. It opens its mouth when danger appears , and the tiny fish swim inside. They swim out only when it's safe again. These catfish may have a _ way to protect their young, but it seems  to work. The catfish in the story live in   _  . A) lakes B) the sea C) rivers D) North America

A: C