Directions:In this section of the test,there are ten paragraphs.Each of the paragraphs is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph.Spell out the missing letters of the word on your Answer Sheet.
Paragraph Nine
We usually rub our eyes due to lack of sleep or to remove dust,imitants,etc. Now,sometimes rubbing our eyes for brief periods can be good because it activates the release of tears which lubricate our eyes.Rubbing even stimulates the vagus nerve which in turn slows down our heartbeat,helping relieve stress.
44.The a______ of rubbing our eyes.
【正确答案】：advantages
