单项选择题 沈某在网络上购买了公民信息，冒充黑社会，打电话对受害人实施恐吓，要求对方花钱买平安，获取了巨额财产。沈某的行为构成：（）

未知题型 听力原文：For most of their lives, the two men had shared confidences, swapped advice and supported each other's ambitions. The dozens of letters that Justice Blackmun saved document a relationship of sometimes startling intimacy.The two men have been very intimate and reliable friends throughout their lives.A．正确B．错误

单项选择题 增值税是我国政府对从事进口贸易的单位和个人，在进口商品报关进口后征收的税种，增值税基本税率为（ ）。 A．0．5% B．1．5% C．15% D．17%