亚当·斯密主张用“看不见的手”自动调节资本主义社会的生产和分配，实行自由主义，反对用人为的制度加以控制，这实际上反映了（   ）

①重商主义的精神②自由主义的思想③代表工业资产阶级的利益④垄断资本主义的思想

科学家将β－干扰素基因进行定点突变导入大肠杆菌表达，使干扰素第17位的半胱氨酸变成丝氨酸，结果大大提高β－干扰素的抗病活性，并且提高了储存稳定性，该生物技术为(　 　)

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

假设“龟兔赛跑”故事中乌龟和兔子在同一直线上比赛，则下列图中最准确地反映故事中龟、兔运动情况的图线是（   ）