According to the passage, which of the following is true of barter？
A. Barter does not exist in the world today any more.
Barter is much easier than the use of money in exchange.
C. Barter makes the exchange of commodities more complex.
D. Barter was practiced only in very ancient civilizations.
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According to Paragraph 2, why did the gold coins used in the United States before 1933 belong to the category of commodity money？
A. Because they were made of the precious metal gold and hence very valuable.
Because they could be used to exchange commodities and were called commodity money.
C. Because the value of a coin was the same as the value of the gold in the coin.
D. Because the value of the gold contained in a coin was more than the value of the coin.
关于斯巴达的论述错误的是()。
A. 斯巴达人大力强化国家机器，形成了贵族寡头政体
B. 在经济上，斯巴达工商业发达
C. 斯巴达国家实行极为严格的军事制度和教育制度
D. 在对外关系上，斯巴达统治者奉行霸权政策
What aspect of butterfly development does the professor mainly discuss？
A. The way in which adults alter their lifecycle to reproduce.
B. Their similarity to other holometabolic creatures.
C. Their transformation from caterpillars into adult imagoes.
D. The four specific phases they experience as they grow.
Why does the man say this:
A. To imply that the professor is digressing onto another topic.
B. To request clarification of a term the professor used.
C. To indicate that the professor needs to speak up.
D. To express doubt about something the professor said.
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