Listen to Li Yang, founder of Crazy English. He speaks English _____ he were American.[ ]

A. if

B. because

C. even if

D. as if

下列哪种提取方法可以采用索氏提取器（）

A.连续回流法

B.升华法

C.煎煮法

D.超临界流体提取法

E.渗漉法