Mario Green and Mary Brown from Riverside High School give up several hours each week to help others．

Mario loves animals and wants to be an animal doctor．He volunteers at an animal hospital every Saturday morning．Mario believes it can help him to get his future dream job．"It's hard work，"he says，"but I want to learn more about how to care for animals．I get such a strong feeling of satisfaction when I see the animals get better and the look of joy on their owners'faces．"

Mary is a book lover．She could read by herself at the age of four．Last year，she decided to try out for a volunteer after﹣school reading program．She still works there once a week to help kids learn to read．"The kids are sitting in the library，but you can see in their eyes that they are going on a different journey with each new book．Volunteering here is a dream come true for me．I can do what I love to do and help others at the same time．"

46．Why do Mario and Mary give up several hours each week？　　

A．Because they want to take a trip．

B．Because they tired．

C．Because they want to help other people．

47．What does Mario want to be？　　

A．An animal doctor．

B．An artist．

C．An engineer．

48．Mary could read by herself when she was　　．

A．three years old．

B．four years old．．

C．fourteen years old．

49．Mary volunteers to help kids learn to　　．

A．dance

B．write

C．read

50．Which of the following can be the best title（题目） for the passage？　　

A．Students Who Volunteer

B．Students Who Love Animals

C．Students Who love Books．