统计指数，是分析社会经济现象数量变化的一种重要统计方法。
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Listen to a short coversation and choose the best answer to the question you hear.[音频]
A. The assignment couldn't be finished until Friday
B. The assignment keeps them too busy all week
C. They still have plenty of time to work on the assignment
D. They will have difficulty completing the presentation on time
Listen to a short coversation and choose the best answer to the question you hear.[音频]
A. He is too busy to go with her
B. He has to read a history book
C. He has already visited the museum
D. He must hand in a report about the museum
Listen to a short coversation and choose the best answer to the question you hear.[音频]
Americans travel around the country in cars
B. Americans are heavily dependent on cars
C. America's roads and highways are highly developed
D. America's traffic problems are serious
Listen to a short coversation and choose the best answer to the question you hear.[音频]
A. They can get clues to our past from old family pictures
B. They are only interested in important events and people
C. They like the 20th-century photographs
D. They like studying ordinary people's family history
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