单选题
1.00分
Yalu river forms a natural boundary between China and North Korea.
参考答案: A
参考解析: 本句话的意思是:“鸭绿江是中朝两国天然的分界线。” border:边界、边疆,例如:They fled across the border.他们穿越边界逃走了。string:绳子,例如:He held out a small bag tied with string.他拿出一个系着细绳的小袋子。spot:地点、场所,例如:He did not mention having been on the spot.他没说他当时在场。 zone:区域,例如:How is the economic development zone going on?现在经济开发区怎样了?