世界消费茶类结构在变化，绿茶消费逐年挤占红茶的市场份额，红茶

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问题填空题

世界消费茶类结构在变化，绿茶消费逐年挤占红茶的市场份额，红茶从过去的90%以上，下降到目前的（）左右。

答案

参考答案：75%

选择题

You can never know ________ when she received our nice birthday presents.

A．how Mary was excited

B．how excited Mary was.

C．How excited was Mary

D．Mary was how excited

单项选择题

在经典激活途径中首先识别抗原抗体复合物的补体成分是

A．C1
B．C1q
C．C1r
D．C3
E．IF(始动因子)