制备乳剂时分散相的体积分数（值）一般在（）之间.
A.1%～10%
B.10%～50%
C.20%～25%
D.25%～50%
参考答案：D
The first decade of the 21st century ______ breathtaking, non-stop development in China．
A．witnesses
B．witnessed
C．will witness
D．had witnessed
与英国人交谈要注意哪些事情？
