How Native Americans developed corn is a puzzling, for no wild com has ever been

游客2023-11-27 44

问题 How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

选项

答案 puzzling—puzzle

解析译文：土著美国人如何种植玉米是个谜，因为至今还没有发现野生的玉米。
分析：考查词性。冠词a后应该加可数名词单数，puzzling是形容词，应改为名词puzzle。

转载请注明原文地址:http://tihaiku.com/zcyy/3222844.html

相关试题推荐

随机试题

最新回复(0)

Maslow’sHierarchyofNeedsAbrahamMaslowhasdeveloped