抗生素的效价测定主要采用 ________和 ________两大类。

W: Have you seen the movie The Departed The plot was so complicated that I really got lost.
M: Yeah. I felt the same. But after I saw it a second time, I could put all the pieces together.
Q: How did the two speakers find the movie().

A. Extremely tedious.

B. Hard to understand.

C. Lacking a good plot.

D. Not worth seeing twice.