12.According to the passage, when did scientists begin to realize that more than one ice age had occurred ? A. In the mid nineteenth century B. In the late nineteenth century C. In the early twentieth century D. In the late twentieth century 你的答案: 正确答案:B 题目解析: 登录...
12.According to the passage, when did scientists begin to realize that more than one ice age had occurred ? A. In the mid nineteenth century B. In the late nineteenth century C. In the early twentieth century D. In the late twentieth century ...