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.
D.Nearly all of the elms died of a disease.
6.From the passage we can learn that the old elm was saved by________.
A.the groove in the bark
B.the fungus in the tree
C.the iron remaining in it
D.its own immune system
7.The underlined sentence “let_nature_take_its_course” means______.
A.leave the elm at the mercy of nature
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