A地的权利人甲对乙所有的土地B地设定通行地役权，并进行登记，后甲将A地卖给丙。下列各项说法正确的是（）。
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【B17】
A. price
B. weather
C. food
D. dress
S02浓度和烟尘浓度是否符合三类功能区的标准要求？()
The governments impose many kinds of control for farm prices and output because ______.
A. farm crops are their main sources of export
B. the prices of different farm crops vary greatly
C. they are fully aware of the importance of them
D. farm prices and output are very unstable
期货合约交易过程简化，具有很强的市场流动性，主要原因在于（）。
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