At that time, it was considered a technological revolution and the start of my study of artificial inteligence.
单项选择题17().
A.rain B.wind C.cloud D.river
单项选择题People who are unhappy ______.
问答题不懂装懂的人总有一天会受到惩罚的。
单项选择题The best title for the article is ______.
单项选择题The writer offered ______ examples to support his argument.