单项选择题

They describe how each process goes( )to the next.

A．befor
B．on
C．in
D．/
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单项选择题
汉译英：“黄曲霉素检验证书；分析检验证书”，正确的翻译为：( )
A．Cextificate of analysis；Certificate of afiatoxin
B．Certificate of aflatoxin；Certificate of analysis
C．Certificate of afiatoxin；Certificate of radioactivity
D．Certificate of radioactivity；Certificate of analysis
单项选择题
I think you probably know China has adopted a flexible policy( )her foreign trade.
A．on
B．with
C．in
D．under
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