单选题 The salesman approached the house cautiously when he saw the vicious dog at the door.
A. carefully B. deliberately C. nervously D. bravely

【正确答案】 A

【答案解析】[解析] 各项的意思是：carefully仔细地，小心地；deliberately故意地；nervously紧张地，不安地；bravely勇敢地，无畏地。划线单词cautiously的意思是：小心地，慎重地。句意是：当看到门口的那条凶恶的狗时，推销员小心地靠近这所房子。所以，答案是A。