() 20. —Could you look after my pet dog for me while I am away?

一.

   A. No,thanks   B. It's my pleasure

   C. I’m sure you will   D. With pleasure

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(D) 

        Do you know you could get sick just by walking past a building? The bacteria (細(xì)菌) that cause Legionnaire’s disease grow very fast in large modern buildings. They are carried by air through the buildings and outside. Legionnaire’s disease is only one of the illnesses that are caused by “sick buildings”.

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