Then one year，agricultural disaster struck Michigan in the form of Dutch Elm Disease.All of the elms lining the road leading to the farm became infected and died.Everyone thought that the old elm would be next.

　　The farm’s owners considered doing the safe thing：pulling it out and cutting it up into firewood before it died.But they simply could not bring themselves to do it.It was as if the old tree had become a family friend.So they decided to let_nature_take_its_course.

　　Amazingly，the tree did not die.Nobody could understand why it was the only elm that was still standing in the country!

　　Plant pathologists(病理学家) from Michigan State University came out to observe the tree.They observed the scar left by the iron chain，now almost completely covered by bark.The plant experts decided that it was the chain that saved the elm’s life.They reasoned that the tree must have absorbed so much iron from the chain that it became immune (免疫) to the fungus (真菌)．

　　It’s said that what doesn’t kill you will make you stronger.Or，as Ernest Hemimgway put it，“Life breaks us all，but afterwards，many of us are strongest at the broken places.”

　　5．What happened to the elms in Michigan during the agricultural disaster?

　　A．The elms were tied by iron chains.

　　B．Some of the elms were cut up into firewood.

　　C．All the elms were infected by a disease and died.

【2016届北师大版高三一轮总复习英语课时作业16】相关文章：

★ 【浙江专用】2014届高考英语一轮复习课时作业(二十九)选修6Unit 4《Global warming》

★ 2016届北师大版高三一轮总复习英语课时作业28

★ 【浙江专用】2014届高考英语一轮复习课时作业(八)必修2Unit 3《Computers》

★ 【北京专用】2014届高考英语一轮复习方案课时作业：选修6 Unit 2 Poems

★ 2014届高考英语一轮复习课时作业(九)必修2Module 3《Music》（外研版）

★ 2014届高考英语一轮复习课时作业(三十五)选修6Module 5《Cloning》（外研版）

★ 2014届高考英语一轮复习课时作业(十九)必修4Module 1《Life in the Future》（外研版）

★ 2014届高考英语一轮复习课时作业(三十三)选修6Module 3《Music》（外研版）

★ 重庆市铜梁中学2013届高三下学期二轮复习定时练习（二）英语试题

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修3 Unit 2 Healthy eating