Tài liệu về Đề thi toefl

The gray scale, a progressive series of shades ranging from black to white, is used in computer graphics ---- detail to graphical images. (A) added (B) to add (C) are added (D) and add 2. By ---- excluding competition from an industry, governments have often created public service monopolies. (A) they adopt laws (B) laws are adopted (C) adopting laws (D) having laws adopt