保证业务的反担保方式有以下几种（）。
A.保证金
B.第三方保证
C.抵押
D.质押
参考答案：A, B, C, D
If you are going to stay in the United States for longer than a(n) ______ visit, you may be interested in learning more about its people and culture.
A．formal
B．regular
C．brief
D．unexpected
（）是每个公民必须遵守的道德准则，也是每个公民应尽的社会责任和法律义务。
A.男女平等
B.尊老爱幼
C.夫妻和睦
D.邻里团结
