题目

 There are many stereotypes( 定型 ) about the character of people in various parts of the United States. In the Northeast and Midwest, people are said to be closed and private. In the South and West, however, they are often thought of as being more open and hospitable . Ask someone from St. Louis where the nearest sandwich shop is, and he or she will politely give you directions. A New Yorker might eye you at first and after deciding it is safe to talk to you, might give you a rather unexpected explanation. A person from Georgia might be very kind about directing you and even suggest some d关于物体受到的浮力，下面说法正确的是A.物体漂浮在水面时，比浸没在水中时的浮力大B.物体在同种液体中排开液体的体积越大受到浮力也越大C.物体浸没在水中越深受到的浮力越大D.物体的密度越大受到的浮力越大