卧室、起居室的墙体，其抹灰底层通常为（ ）。

Write two letters on acceptance and refusal to the following claim letter respectively for the exporter after reading the following letter.Dear Sirs，We refer to sales contract No．508covering the purchase of 200metric tons of white cement.We telexed you on 17May informing you that the consignment arrived on 20April.On inspection，we found that 180bags had burst and that the contents，estimated at 9000kg，had been irretrievably lost.We proceeded to have a survey report made．The report has now confirmed our initial findings．The report indicates that the loss was due to the use of substandard bags for which you，the suppliers，are responsible.On the strength of the survey report，we hereby register our claim against you as follows：Short delivered quantity GB￡180Survey charges GB￡50Total claimed GB￡230We enclose survey report No．TS6478and look forward to early settlement of the claim.Yours faithfully，Reply Letter 1 点击查看答案

受消费习惯、交易成本等因素的影响，目前( )的发展还不是很成熟，这方面的业务主要集中在境外公司和个人在我国境内承租房屋的代理上。

A.房地产买方代理业务
B．房地产卖方代理业务
C．住宅经纪业务
D．商业房地产经纪业务

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