“The cornea角膜is like a five-layered sandwich”,says Raymond Curran,a doctor from Omagh,Northern Ireland.“Once the bacteria get into a layer they can reproduce there and turn the cornea opaquetoo dark to see through.”
An optician验光师)may see one possibly sight-threatening case each month,but at an eye hospital there may be several each week.Acanthamoeba,often seemingly mild,can be misjudged until it is too late.Meanwhile,pseudomonas,more seriously,can cause increasing sight loss with each hour that passes.If not treated immediately,patients may need a corneal replacement.
And the really bad news,according to Professor Roger Buckley,at the Moorfields eye hospital in London,is that acanthamoeba is“one of the hardest germs on Earth”——it can survive in Antarctica.
Question 2:In the passage the writer mainly wants to tell us ________.
A.the possible danger of contacts
B.the importance of keeping contacts clean
C.some doctors’ opinions about contacts
D.the advantages and disadvantages of contacts
3.With only about1000 pandas left in the world,China is desperately trying to clone克隆 the animal and save the endangered species物种.That’s a move similar to what a Texas A&M University researchers have been undertaking for the past five years in a project called “Noah’s Ark”.
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