ervals of time.
25.People''s expectations for a higher standard of living increase as conditions in their community improve.
26.Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.
27.All of the plants now raised on farms have been developed from plants that once grew wild.
28.Even though relatively costly, the diesel engine is highly efficient and needs servicing infrequently.
29.Sculptors shape images out of clay, stone, and metal.
30.The modern circus dates from the end of the eighteenth century.
31.The boiling point of any liquid is determined by the pressure of the surrounding gases.
32.The Ranger spacecraft provided more than 17,000 pictures of the moon.
33.Many people who live in New York City think that life in a large city offers special advantages.
34.The scientific revolution of the early 1900''s affected education by changing the nature of technology.
35.Meadowlarks are about the same size as robins, but they have heavier bodies, shorter tails, and longer bills.
36.On May 20,1932, Amelia Earhart became the first woman to fly solo across the Atlantic Ocean.
37.Translated into terms of psychological theory, association has been thought of as the basis of learning, conditioning, and creative thinking.
38.The Statue of Liberty was originally proposed in 1865 to commemorate the alliance of France with the American colonies during the American Revolution.