13．
Look carefully at the back of a California state quarter．A man with a walking stick is pictured there．A bird called a California condor（大禿鷲） is flying overhead．Who is this man，and why is he so important that he is featured（處于顯著地位） on the back of a coin？
The man on this quarter is John Muir．Even as a child，Muir loved watching nature．As a young man，he spent much of his life exploring the beauty of the wilderness．He walked more than a thousand miles across the country，through fields and woods．John Muir liked writing about the places he visited，describing their beauty．
Muir also wrote about problems．In order to create more farmland for sheep and cattle，many trees were being cut down．This made Muir unhappy and worried，because he knew that trees were important to forests and to the animals that lived in them．Muir believed that nature should be conserved（保護(hù)） instead of being changed by human beings．He wrote articles in magazines and newspapers to spread the word about conserving forests．Soon，others began to listen．
Muir wrote letters to important people，such as President Theodore Roosevelt．The president admired Muir's love for nature．When Roosevelt came to visit Muir in California，Muir convinced（說(shuō)服） the president to go camping with him for three nights under the trees so they could talk about conservation．Later，President Roosevelt set aside 148million acres of land for national forests and established（建立） five national parks．National parks are large areas of land that are protected form development．This means that people cannot build homes or businesses there．One of these parks in Yosemite National Park，the area that is featured on the back of the California quarter．
Though it has been almost one hundred years since John Muir died，people continue his work today．His work as a conservationist helped us to see the beauty of our natural world．John Muir made us understand the importance of protecting our earth and our resources-then，now，and for the future．
41．What did John Muir spend much of his life doing when he was a young man？C
A．Watching natural views．
B．Writing about the places he visited．
C．Exploring the beauty of the wilderness．
D．Creating farmland for sheep and cattle．
42．Why did President Theodore Roosevelt visit John Muir？C
A．Because Roosevelt loved watching nature．
B．Because Roosevelt received letters from John Muir．
C．Because Roosevelt admired John Muir's love for nature．
D．Because Roosevelt was sad about the problems with farmland．
43．What happened after President Roosevelt went camping with John Muir？B
A．Many trees were cut down．
B．Five national parks were established．
C．More home and businesses were built．
D．More farmland was used for sheep and cattle．
44．Why is John Muir featured on the back of a California state quarter？B
A．Because he walked over a thousand miles across the country．
B．Because he helped people understand the importance of protecting the natural world．
C．Because he wrote articles to spread the word about conserving forests．
D．Because he once wrote several letters to President Theodore Roosevelt．
45．What is the writer's purpose of writing this article？C
A．To advise readers to become active conservationists．
B．To make us interested in the story about a great man．
C．To tell us something about an important person in history．
D．To give information about how to conserve the environment．
