“既然生产关系对生产力有反作用，那么只要不断变革生产关系，使公有制范围扩大，公有化程度提高，就会促进生产力的发展。”

谈谈你对这句话的看法。

20世纪90年代后期，与我国其他沿海地区相比，珠江三角洲工业化、城市化进程较快的主要原因是（   ）

试估计$\sqrt{75}$的大小范围是(      )

Jack is a clerk of a bookstore. Here is the note from his boss, Ben. Jack has to decide what books to order according to the following note and the descriptions of the books.
Hi Jack,
You must hand in the order list of books to me by the first working day of every month. The rules for choosing books are:
For textbooks:
● August is coming. We must choose all textbooks, without thinking of other rules.
For books which are not textbooks:
● If more than five copies of books were sold last month, we choose them. But if there are five copies or more in stock (现货), we do not make an order.
● If the wholesale (批发) prices of the books are higher than $75, we do not choose them. And we do not order anything whose retail (零售) price is higher than $100.
Ben
The descriptions of the books