[听力原文]11-15

Hotel bars are (11) （） in the United States. Also, you are often asked to (12) （） at the bar, while waiting for a table in a restaurant. People drink large quantities of beer and whiskey, but most characteristic is the great number and variety of cocktails available.

Some people do not have access to alcohol all their lives. They believe too much drink will (13) （）like heart attack. But according to recent studies, liquor--no more than three drinks a day--may significantly (14) （）of a heart attack. Moderate drinkers experience about 30 percent fewer heart attacks than the totallers. They also have lower blood pressure than both total and (15)（）

What do recent studies show
No more than three drinks a day may significantly（）of a heart attack.