Gooseneck barnacles attach themselves to objects such as docks and boats.

单项选择题Located in Washington, D.C., the Library of Congress contains an imposing array of books on every conceivable subject.

单项选择题The Railway Labor Mediation Act of 1926 supported the use of collective bargaining to avert interruption of rail service.

单项选择题Winston became quite avaricious in his late life.

单项选择题The term “composition” refers to the way the components of a drawing are arranged by the artist.

单项选择题Biologists have ascertained that specialized cells convert Chemical energy into mechanical energy.