单项选择题

社会主义改造理论,具体时间是从1949年10月中华人民共和国成立到1956年社会主义改造完成。

A．对
B．错

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直线与直线的夹角余弦为__________.‌

答案：错误

单项选择题

Have you ever observed that __________? In other words, people who are similar become friends or do things together.
A、 the early bird catches the worm
B、 birds of a feather flock together
C、 people like to be as free as a bird
D、 a little bird told me