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a.2岁
b.5岁
c.4岁
d.3岁

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某粮油公司为增值税一般纳税人，主营各种杂粮、食用植物油，兼营烟、酒、食品、饮料、罐头食品。2007年7月取得杂粮、食和植物油含税销售收入870000元，烟、酒含税销售收入30000元，食品、饮料、罐头食品销售收入240000元，该公司2007年7月的销项税额为。

You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.)
01 [ServiceContract]
02 public interface IDataUpdate
03 {
04 [OperationContract]
05 [TransactionFlow(TransactionFlowOption.Mandatory)]
06 void Update(string accountNumber, double amount);
07 }
08
09 ...
10 class UpdateService : IDataUpdate
11 {
12 [OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]13 public void Update(string accountNumber, double amount)
14 {
15 try
16 {
17 ...
18 }
19 catch(Exception ex)
20 {
21 WriteErrorLog(ex);
22 ...
23 }
24 }
25 }
26Customers report that the transaction completes successfully even if the Update method throws an exception.You need to ensure that the transaction is aborted if the Update method is not successful.
What should you do？（）

a.榜样示范法
b.正面教育法
c.说服教育法
d.正强化法

a.5个月
b.3个月
c.1个月
d.10个月