题目内容
（请给出正确答案）
[主观题]
I think you probably know China has adopted a flexible policy（)her foreign trade.A．on
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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测定牛乳乳清的折射率即可了解乳糖的含量，判断牛乳是否掺水。()
