19．Volunteering takes up our time，energy，and sometimes，money．But why do people still do that？Here are the reasons：
Volunteering is good for others．There are many people in need．Governments and professionals try to meet everyone's need，but it's difficult for them to do it all．That's a hand to the people who need help．If people only think of themselves，the world will become a cruel place．But when we try to help each other，we can help make our planet a better and happier home．
Volunteers and volunteer groups can bring food for hungry people，provide homes or clothes for those who need them，protect wildlife and natural areas．They care for people who are sick or disabled．They can help people learn to read or do better at school．
On the other hand，volunteering is good for yourselves．You might get in return for your giving，for example，getting more active and healthier，spending time doing what you really care about，and having fun!
阅读短文内容，判断下列句子的正、误．正确写A，错误写B．
46．The world needs volunteers because there are many people in need．A
47．It is difficult for government to meet everyone's need．A
48．Volunteers can help people in trouble，but can't protect the environment．B
49．Volunteers can become happier and healthier in return．A
50．The writer gives some reasons to tell us why people don't want to be volunteers．B．
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