第二节：语法填空(共10小题；每小题1.5分，满分15分)

One of the major holiday shopping days is the day after Thanksgiving. It is frequently referred to     31     Black Friday. The use of the word “black” relates to the business accountants. Storekeepers used to record profits in black ink and losses in red ink. So     32     (be) “in the black” on the Friday after Thanksgiving means a good thing, a return to profit.

Black Friday is the big day for many retailers, and it presents the shopper an opportunity     33     (get) all of one’s holiday shopping done at once among amazing sale prices. On that day, most retailers     34     (open) very early and usually provide massive and     35     (attract) discounts on their product,    36     a great number of holiday shoppers will get an early start in the morning to begin Christmas shopping.

Black Friday     37     means that people face crowded stores,    38     is the other idea of a “Black Friday”,    39     day they do not like. It used to be     40     (busy) shopping day of a year. Many people avoid this shopping day altogether because of the stress involved in fighting the crowds. In recent years the Saturday before Christmas has seen the biggest shopping crowds.

硫酸能与烯烃、多环芳烃产生化学反应从而将其在石油精制过程中除去（）。