简述评定饲料营养价值的方法。

农产品质量安全监管的重要内容是？（）

A.农产品产地污染源头预防

B.农业面源污染治理

C.农作物资源保护

D.农业生产过程清洁

在国际工程投标报价时，下列工程可以报得低一些的是( )。

A．工期要求急的工程
B．竞争对手少的工程
C．支付条件不理想的工程
D．施工条件好的工程

监理人调换总监理工程师需经( )同意。

A．投标人
B．委托人
C．总监理工程师
D．行政部门

函证

E

It was December 25. Marie, a 13-year-old Australian girl, was happy. It was Christmas and Marie’s mother was making a very special cake. She put four small coins into the cake and then baked it. The four coins were for good luck. After dinner, Marie and her family ate the cake. They found three coins in the cake and put them on the table. Where was the fourth one It was missing(找不到的), but Marie’s mother didn’t notice.
After Christmas, Marie got sick. She coughed and couldn’t speak. Marie’s parents took her to hospital. Doctors at the hospital looked her over and then said," We are sorry, but we can’t help her. "For 12 years, Marie didn’t speak. But like other common people, she grew up, she got a job, she got married. One day, when Marie was 25 years old, she got a sore throat. She began to cough. She coughed up something small and black. What was it Marie didn’t know. She took it to a hospital. A doctor at the hospital said," This is a coin!" The doctor told Marie," I think you can speak again. \

How old was Marie when she became unable to speak ( )

A．She was 12.

B．She was 13.

C．She was 25.

D．She was 27.