28. Paleoanthropologists examine fossil remains of extinct primates, while physical anthropologists concern with ethology study the behavior of primates in their natural settings.
D
C
B
A
37. Among the most complex cryslals are that of silicon dioxide, which has seven different structures at varjous temperatures and pressures, the most common being quartz.
D
C
A
B
39. By 1810 the 23 towns of Hampshire County, Massachusetts, had reached a remarkable uniform of economic development as well as population density.
D
C
B
A
40. With more than half the world's annual yield of 50 million tons of soy beans, an important source of protein, is grown in the United States.
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发表于 2005-10-9 11:20:00
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