芒硝主含的化合物为
A．含水碳酸锌
B．含水硅酸镁
C．含水碳酸钙
D．含水硫酸钙
E．含水硫酸钠
参考答案：E
The idea ______ you can own land in a city and do what you like with it is simply ridiculous. [ ]
A. that
B. how
C. whether
D. which
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