21.　　 Eliminating problems by transferring the blame to others is often called scape-goating.

　　22.　　 The chief foods eaten in any country depend largely on what grows best in its climate and soil.

　　23.　　 Over a very large number of trials， the probability of an event's occurring is equal to the probability that it will not occur.

　　24.　　 Most substance contract when they freeze so that the density of a substance's solid is higher than the density of its liquid.

　　25.　　 The mechanism by which brain cells store memories is not clearly understood.

　　26.　　 By the middle of the twentieth century， painters and sculptors in the United States had begun to exert a great worldwide influence over art.

　　27.　　 In the eastern part of New Jersey lies the city of Elizabeth， a major shipping and manufacturing center.

　　28.　　 Elizabeth Blackwell， the first woman medical doctor in the United States， founded the New York Infirmary， an institution that has always had a completely female medical staff.

　　29.　　 Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone.

　　30.　　 Because its leaves remain green long after being picked， rosemary became associated with the idea of remembrance.

　　31.　　 Although apparently rigid， bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.

　　32.　　 That xenon could not form chemical compounds was once believed by scientists.

　　33.　　 Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.

　　34.　　 The elimination of inflation would ensure that the amount of money used in repaying a loan would have the same value as the amount of money borrowed.

　　35.　　 Futurism， an early twentieth-century movement in art， rejected all traditions and attempted to glorify contemporary life by emphasizing the machine and motion.

　　36.　　 One of the wildest and most inaccessible parts of the United States is the Everglades where wildlife is abundant and largely protected.

　　37.　　 Lucretia Mott's influence was so significant that she has been credited by some authorities as the originator of feminism in the United States.

　　38.　　 The activities of the international marketing researcher are frequently much broader than those of the domestic marketer.

　　39.　　 The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific.

　　40.　　 Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them.