21. The snapper, a large-headed fish with a long dorsal fin, is named to its characteristic way of suddenly, shutting its mouth.
不知道选B还是选C?怎么改
35. By 1900 several prominent technical institutions, including the Massachusetts
laceType w:st="on">InstitutelaceType> of laceName w:st="on">TechnologylaceName>, fashioned its own educational offerings to meet the industrial needs of the United States.
35. By 1900 several prominent technical institutions, including the Massachusetts
laceType w:st="on">InstitutelaceType> of laceName w:st="on">TechnologylaceName>, fashioned its own educational offerings to meet the industrial needs of the United States.