The word "load" in line 23 is closest in meaning to（）
A. weight
B. number
C. section
D. level
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Before the Europeans arrived, American Indians were using virgin copper （） into ornaments, knives, and other artifacts.
A. Which was hammering
B. which hammered
C. was hammered
D. hammered
The word "standard" in line 12 is closest in meaning to（）
A. practical
B. customary
C. possible
D. unusual
A因抢劫罪被判处有期徒刑5年，他于1993年4月30日收到判决书，他依法享有上诉权的期间的最后一日是：
A. 38845
B. 38847
C. 38846
D. 38854
What does the passage mainly discuss（）
A. The history of surveys in North America
B. The principles of conducting surveys
C. Problems associated with interpreting surveys
D. The importance of polls in American political life
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