In terms of organization, the two major parties ______.
A、have tight organizational structure
B、have strong leadership at the national level
C、are well organized at the grass roots level
D、are merely political forces coming together in a loose way
【正确答案】：D
【题目解析】：本题考查美国的两大政党，根据课本P245可知，就组织而言，两大政党不过是松散结合在一起的政治力量。
