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The Romans first found truly waterproof cement in the early 19th century.

A. Y
B. N
C. NG

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People in ancient times weren't able to make diverse materials, but they could use every subject occurring in the nature.

A. Y
B. N
C. NG

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Stone and marble are often used in sculpture and monument.

A. Y
B. N
C. NG

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A．Use the formal manner of address.B．Use the informal manner of address.C．Address peop

A. Use the formal manner of address.
B. Use the informal manner of address.
C. Address people by their first names.
D. Address people by their last names.

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We can use timber as the most crucial material to promote design and crafts.

A. Y
B. N
C. NG

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The Romans first found truly waterproof cement in the early 19th century.

A. Y B. N C. NG

People in ancient times weren't able to make diverse materials, but they could use every subject occurring in the nature.

Stone and marble are often used in sculpture and monument.

A．Use the formal manner of address.B．Use the informal manner of address.C．Address peop

We can use timber as the most crucial material to promote design and crafts.

A. Y
B. N
C. NG