In order to perform the monitor function, language learners have to satisfy at least three conditions :______to monitor his production, focus on form and clean knowledge of the rules of the target language.

A．enough speed

B．much information

C．sufficient material

D．sufficient time

某集团洗选安全质量标准化是以提高经济效益为指导思想，以“（）”为目标，充分征求各选煤厂意见制定的。

A、安全

B、优质

C、低耗

D、高效