问题补充：
By the time California to become the 31th federal state of the USA in 1850, it was already a multicultural society.
A. selected
B. collected
C. existed
D. elected
答案：
A. selected
B. collected
C. existed
(答案→)D. elected
解析：词义辨析。A. 挑选 B. 收集 C. 存在 D. 选举；推选。句意：等到1850年加利福尼亚州选择成为为美国第三十一个联邦的时候，它已经是一个多元文化的社会。故选D。
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