单选题 In 1964, a severe earthquake occurred near Anchorage, Alaska. It was reported to have reached a magnitude of 8.4 ______ the Richter scale.
【正确答案】 A
【答案解析】[解析] 1964年,阿拉斯加州的安克雷奇附近发生了一场大地震。据报道,这场地震达到了里氏8.4级。表示里氏…级的固定用法为…on the Richter scale。