单项选择题

This passage is mainly about______.

A. our modern road-building methods
B. Roman tools and machines
C. how the Romans built highways
D. how to dig stone with fire and water
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填空题
Doctors say wear loose ______ clothes made of natural materials, can protect yourselves from the dangers of extreme heat.
单项选择题
Why did Tom sit up awake until two in the morning
A. Because it was too noisy.
B. Because he wanted to join the party.
C. Because he was too tired.
D. Because he turned on some music.
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