The word its in the passage refers to
A. copper
B. bronze
C. metal
D. iron
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According to paragraph 2, what happens as societies become more prosperous？
A. More goods are produced.
B. Walled cities are built.
C. Laws are instituted.
D. The size of families increased.
【C10】
A. dedication
B. suspicion
C. contemplation
D. speculation
According to paragraph 3, how was the class system structured？
An upper class and a lower class
B. Slaves, free people, and a ruling class
C. A king, an army, and slaves
D. Intellectuals and uneducated farmers and workers
Why is wireless recharging a depressing promise for experienced observers of the electronics industry？
A. It is not easy to put the theory into profitable production,
B. Wireless recharging needs new theories besides Faraday's.
C. Wireless recharging can't make profit for businesses.
D. It is hard to challenge the monopoly of Splashpower.
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