建筑石膏是()型的()膏,硬化后的石膏的化学成分是()。
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Nearly one third of the people we interviewed think people from different cultures shouldn't get married, claiming that they cannot be____.
Telecommunications technologies have____into everyday life so deeply that modern society could not function without them.
For a long time the US was regarded as a melting pot. This meant that all the ____.elements would be melted down into 100% American.
Out-of-town tourists____about a third of the amazing annual figure of six million visitors.