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For holding bricks and stones together, a bridge needs great deal of mortar, a mixture of sand, wate...
题目内容：
For holding bricks and stones together, a bridge needs great deal of mortar, a mixture of sand, water, and cement (水泥). Here “mortar” means “___” in Chinese.
A. 工人 B. 机器 C. 砂浆 D. 电子设备
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