33 Margaret Mead achieved world famous through her studies of child-rearing, personality, and
£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ _____£ _____£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ ________
£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  A£ £ £ £ £ B£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ C
culture.
_____
£ £  D

34 The discovery of the antibiotic penicillin in 1928 has not produced antibiotics useful for the
£ £ £ £ £ £ _______£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ _____________£ £ £ £ £ £ £ £  ____£ £ £ 
£ £ £ £ £ £ £ £  A£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ B£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ C
treatment of infectious diseases until 1940.
£ £ £ £ £ £ £ £ £  _______
£ £ £ £ £ £ £ £ £ £ £ £ D

35 In the United States, the Cabinet consist of a group of advisers, each of whom is chosen by£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  ____£ £ £ £  _______£ £ £ £ £ £ £ __________£ £ £ _____
£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  A£ £ £ £ £ £ £ £ B£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ C£ £ £ £ £ £ £ £ £ D
the President to head an executive department of the government.

36 Colleges in the newly formed United States, in recovering from the adverse effects of the
£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  ________£ £ £ £ £ £ £ £ £ £ £ £ £ £ ____£ £ £ £ £ £ £ £ 
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American Revolution, inaugurated a broad curriculum in response of social demands.
£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  _____£ £ £ £ £ £ £ £ £ £ £ ______£ £ 
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37 Humus is formed during soil microorganisms decompose animal and plant material into£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  ____£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £  ____________£ £ £ £ £ £ £ £ £ £ £ 
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elements usable by plants.
______£ £ £ £ £ £ £ £  _____
£ £  C£ £ £ £ £ £ £ £ £ £ £ £  D

38 Ozone is an unstable, faintly bluish gas that is the most chemical active form of oxygen.
£ £ £ £ £ £ £ £ £ £ __£ £ £ £ £ £ £ ____£ £ £ £ £ £ £ £ £ ___£ £ £ £ £ £ £ £  ______£ £ £ £ £ £ £ £ 
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39 The development of professional sports in the United States dates back to nineteenth century.