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4. (5.0 points )Woods such as fir, pine and redwood are mainly used for interior decoration, such as floors.
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5. (5.0 points )Steel is outstanding as a structural material, because it never deforms and can thus be used in skyscrapers.
6. (5.0 points )The mixture of water, sand and gravel can be compressed into concrete.
1. Match the phrases with their Chinese equvilents.（20.0 points）
具有双重国籍的开国上将是（）。
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