I'm very _____ with what _____ at the meeting.[ ]

A. pleased; he said

B. pleased; will he say

C. pleasant; he will say

D. pleasant; he spoke

用ICP-AES法测定金属元素总量时，对于污水应取含悬浮物的均匀水样，对于地表水应待自然沉降（）min后，取上层非沉降部分分析。

A．20

B．25

C．30

D．35