单选题
The gnu, or wildebeest as it is sometimes called, is a horse like animal that lives in southern Africa. It is a (1) animal. Weighing 300 to 475 pounds, the gnu is equipped (2) high, large shoulders and a thick neck. Its big head has long horns that curve upward (3) buffalo horns. Clumps of stiff hair grow on the gnu's forehead, neck, and shoulders, (4) on its long, horse like tail. Gnus are often (5) "horned horses" by the people of Africa. They live in herds the (6) horses do, and they can be just as playful as any colt. But gnus can gallop as (7) as fifty miles an hour. Thus they can easily (8) any horse. They are also more dangerous fighters than horses (9) they are very good at butting their enemies with their sharp hours. There are two (10) of gnus. One is known as the white-tailed gnu. This kind has become (11) extinct. That is, only a few are still to be (12) in the wild. The white tailed gnu stands about three and a half feet (13) at the shoulders and has a fierce, hairy face. Its coat has black and white markings. Its tail is yellowish-white. The horns of a white-tailed gnu are only two feet (14) . The second type is known as the brindled gnu. It attains a height of four and a half feet (15) the shoulders. This (16) has a sad-looking face. The brindled gnu has yellowish-brown or gray hair with dark stripes (17) its shoulders and neck. Its curved hours are almost three feet long. Gnus (18) over Africa from northern Kenya to northern South Africa and Southwest Africa. They have a simple (19) . They look for leaves, twigs, and grass to eat. Since gnus are (20) to raise in captivity, you can find them in many American zoos.