听力原文：Hand washing is a powerful way to prevent the spread of diseases. （29)Study found

听力原文： Hand washing is a powerful way to prevent the spread of diseases. (29)Study found that one million lives prevented from spreading by hand washing．When people get bacteria on their hands, they can infect themselves easiest way to catch a cold is to touch your nose or eyes after someone nearby has sneezed or coughed. Another washing is especially important before and after preparing food, before eating and after using the toilet, and it is important to wash your hands often when someone in your home is sick. (31)The experts say the most effective way to wash your hands is to rub them together while using soap and warm water. Be sure to rub all areas of the use public bathrooms and dry their hands with a paper towel should use the towel to turn off the water.

(30)

A．Virus is transmitted by shaking hands with others.

B．The infectious disease can't be prevented from spreading.

C．Hand washing can save a million lives each year.

D．Bacteria on hands may cause heavy cold.