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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.
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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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A. He should have taken more courses.
B. He will probably fail the test this Friday.
C. He is not good at playing games.
D. He should remember all those names and dates.
[音频][音频]
A. Working outside in the yard.
Baking breakfast in the yard.
C. Making lemon juice.
D. Enjoying the air conditioning.
[音频]
A. It was invented during World War II.
B. It was available in people's homes since 1902.
C. It was invented by Willis Carrier.
D. It was available immediately after its invention.
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