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.

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