16．Bacterial cultures are used commercially in the preparation of food products such that yogurt ,sour cream ,and vinegar.
17.Anyone with absolute ,or perfect,pitch are able to identify by ear any note at some standard pitch or to sing a specified note at will.
18.Sea horses usually live along the shore among seaweed and other plants to which they cling to by their tails.
19.Babies have soft spots between the bones of their skulls ,which allowing for further growth.
20.T.S.Elot,who a poet ,playwright, literary critic ,and editor ,was a leader of the Modemist movement in poetry.
21.The Pacific Ocean comprises almost the entire boundary western of North and South America.
22．Established in 1948 ,the State University of New York is the singly largest university system in the United States.
23.Photography disseminates information about humanity and nature ,records the visible world, and extension human knowledge into areas the eye cannot penetrate.
24.Because of their rapidly changing economically fortunes, many frontier towns of the American West underwent spectacular fluctuations in population in the nineteenth century.
25.Virtually no disease exists today for which there is no drug that can be given ,neither to cure the disease or to alleviate its symptoms.
26.Calcium is essential for blood clotting ,for the action of certain enzymes, and for the normal contraction and relax of muscles.
27.The large collection of the Williams College Museum of Art includes ancient and medieval art ,but much exhibits are modern or contemporary.
28.The technique of spectroscopy allows analyst of incoming light after it has been separated into its component wavelengths by passage through a prism.
29.Today ,fifty years after its construction ,the Alaska Highway conveys 40,000 vehicles in normal year.
30.Since prehistoric times ,artists (have been) arranged colors on surfaces (in ways) (that express) their ideas (about people) ,the world ,and religion.
31.(Few substances) look less (alike than) coal and diamonds ,yet both (are fashioned) (from same) elemental carbon.
32.Meteorologists can program their computes to scan for a specific set of weather criteria, such as falling barometric pressure ,increase cloud cover ,and rising humidity.
33.Obsidian is formed when siliceous lava cools too rapidly to crystallized into rock-forming minerals.
34.European settlers in North America moved from the Atlantic coast across 3,000 miles forests, grasslands, deserts, and mountains until they reached the Pacific Ocean.
35.Philosophy tries to discover the nature of true and knowledge and to find what is of basic value and importance in life.
36.In this world of high technology ,it is easy to forget that the most important tools ever developed for learning is still the book.
37.The element potassium makes up less than one half percentage of the human body.
38.Twenty thousand years ago a sheet of ice a thousand meters thick covered the coastal region which the cities of Vancouver and Juneau now are located.
39.The Crow ,Blackfoot ,and Sioux tribes traditionally adorned they dwellings and costumes with colorful and highly valued beaded decorations.
40.In the late 1800’s ,United States painter Thomas Eakins develop a broad ,powerful Realist style that became almost expressionistic in his later years.
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