A、16.61 feet. B、20.11 feet. C、56.16 feet. D、61.72 feet. D

　　Flooding along the Mississippi River near Cairo, Illinois, was near its forecast peak Sunday morning as the threat from the rain-swollen waterway continued to roll south. (3)The Ohio River, where it joins the Mississippi was just centimeters below its forecast peak of 56 feet—16 feet above flood stage but well below the historic 61.72-foot peak of 2011, according to the National Weather Service. Still, the damage of flood prevention works in Alexander County, on the southern tip of Illinois, sent some residents fleeing and left others surrounded by water Saturday. (4) The river bulled through the flood prevention works in Thebes, Illinois, early Saturday, sending water rushing as far as six miles away from the Mississippi’s usual banks. Cities such as Miller City and Fayville were cut off, but no injuries were reported.
　　3. What is the historic peak of the Ohio River according to the news item?
　　4. What damage has the flood caused?