Born on July 31, 1965, in Gloucestershire, England, Joanne Kathleen Rowling grew up in rural communities in the southwestern part of that country. Rowling’s childhood experiences (67) her future literary creations. She explored the English countryside, visiting (68) and historical sites which inspired her (69) .Although she disliked science and mathematics courses, Rowling (70) in literature classes. She penned funny, fantastical tales to (71) her sister Diana and friends, (72) the Potter siblings whose name she later (73) for her wizardry novels.
As a teenager, Rowling dreamed of becoming a (74) author whose books were sold in stores. She kept her ambitions a secret, (75) , because she feared criticism and discouragement from people who might declare that her writing was (76) Rowling gradually became more self-confident and was (77) Head Girl during her final year at school. (78) languages at Exeter University in order to be (79) as a bilingual secretary, Rowling graduated with a degree in French and Classics. This (80) knowledge aided her later clever (81) of characters in the Harry Potter books.
Rowling then (82) to Manchester for other office positions. She wrote fiction for adult readers but did not (83) it for publication. She also often visited her (84) mother. It was during one of these train trips (85) Rowling began inventing characters and (86) .

A．arrangement

B．construction

C．layout

D．modification

根生长的趋性及其在生产中的应用有什么？