Đề luyện thi Toefl
1. 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
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