Jeff Corwin is a scientist and writer. He does these jobs with one life goal help save animals and their habitats. His latest book, 100 Heartbeats:  The Race to Save Earth's Most Endangered Species. Is a collection of stories about animals on the edge of _ . Corwin recently talked to a reporter. Reporter: How would you describe your job? Corwin: My job is to travel around, look at animals and tell their stories. Reporter : When did you know this is what your wanted to do? Corwin:  I knew that when I was 6 years old. My dad was a police officer, and we lived in the city. I really enjoyed the time when I could go to the quiet countryside. One day I saw my very first wild snake and I knew that's what I would do for the rest of my life. I didn't know if I would be a teacher or a zookeeper, but I knew I would have a life connected with nature. Reporter: Why did you write the book? Corwin: We are losing species very fast. _ If we make big changes, we may have the chance to save what remains. Reporter: Is it true that humans are the reason that many of these animals are in danger? Corwin: Human beings have a powerful effect on every other living thing. It's important to make that effect a positive one. ,. Jeff's life goal is to   _  . A) protect the environment B) do some scientific research C) save animals and their habitats. D) Let more people know about nature.
C

Rivers are one of our most important natural resources . Many of the world's great cities are located on rivers, and almost every country has at least one river running through it that plays an important part in the lives of its people. Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Ganges is great, but it is also important for transportation; ships can travel along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeastern Asia. The greatest of all for navigation , however, is the Amazon in Brazil . It is so wide and so deep that large ships can go about two thousand miles up it. Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply  of water for crops, engineers sometimes build a dam  across a river and let a lake form behind the dam. Then people can use the water not only to irrigate  their fields but also to make electricity for their homes and industries. However, large cities and industries that are located on rivers often cause problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources. When rivers are dammed, people use the water for   _  . A) keeping the rivers clean B) making electricity C) washing clothes D) irrigation and the production of electricity
D

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. Which of the following is TRUE according to the passage? A) Our bodies cannot absorb lycopene. B) Watermelons are good for us in hot summer. C) Tomatoes have more lycopene than watermelons do. D) Lycopene in watermelons is hard for our bodies to absorb.

B