Only a few visitors are allowed inside the church at a time, and they enter the building and can stay for only 15 minutes each. However, fatty lipids from visitors' skin can combine with dust in the air and pollute the painting if they come in contact with it, says study researcher Nancy Daher of the University of Southern California.

　　Even previous restorations of the painting may pollute its surface, Daher said. Tiny particulates of the wax applied during early repair efforts can be emitted from the painting, get into the air and tarnish (使失去光泽) the painting in the same manner as the fatty lipids.

　　The researchers noted that their airsample analysis could be used as a point of reference for future studies aimed at protecting valuable artwork and artefacts.

　　1．What does the underlined word “particulates” in Paragraph 2 probably mean?

　　A．The smallest parts of a chemical substance.

　　B．Things dirtier than usual.

　　C．Certain types of gas.

　　D．Extremely small pieces of dirt, which cause serious pollution.

　　2．According to the text, the following factors pollute the painting EXCEPT

　　________．

　　A．fatty lipids from the skin

　　B．tiny particles of the wax

　　C．breath of the visitors

　　D．dust in the air

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