V. Read the following passage carefully, and then select the best option A, B, C or D to complete it.
Approximately one-third of the Arctic Ocean is underlain by continental shelf, which includes a broad shelf north of Eurasia and the narrower shelves of North America and Greenland. Seaward of the continental shelves lies the Arctic Basin proper, which is subdivided (26) _______ a set of three parallel ridges and four basins (also known as deeps). These features were discovered and explored (27) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (28) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland. Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, (29) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins. The average depth of the Arctic Ocean is only 1,300 m (4,300 ft) because of the vast shallow expanses on the continental shelves. The deepest (30) _______ in the Arctic Ocean is 5,450 m (17,880 ft).
(28)
A.most
B.mostly
C.all
D.almost
Approximately one-third of the Arctic Ocean is underlain by continental shelf, which includes a broad shelf north of Eurasia and the narrower shelves of North America and Greenland. Seaward of the continental shelves lies the Arctic Basin proper, which is subdivided (26) _______ a set of three parallel ridges and four basins (also known as deeps). These features were discovered and explored (27) _______ in the late 1940s. The Lomonosov Ridge, the major ridge, cuts the Arctic Basin (28) _______ in half, extending as a submarine bridge 1,800 km (1,100 mi) from Siberia to the northwestern tip of Greenland. Parallel to it are two shorter ridges: the Alpha Ridge on the North American side, defining the Canada and Makarov basins, (29) _______ the Arctic Mid-Ocean Ridge on the Eurasian side, defining the Nansen and Amundsen basins. The average depth of the Arctic Ocean is only 1,300 m (4,300 ft) because of the vast shallow expanses on the continental shelves. The deepest (30) _______ in the Arctic Ocean is 5,450 m (17,880 ft).
(28)
A.most
B.mostly
C.all
D.almost
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