设某企业生产某种半成品2 000件，完成一定加工工序后，可以立即出售，也可以进一步深加工之后再出售。如果立即出售，每件售价15元，若深加工后出售，售价为24元，但要多付加工费9 500元，则继续进行深加工的机会成本为()元。
A. 48 000
B. 30 000
C. 9 500
D. 18 000
查看答案
Teachers constantly reflect on what they do as a teacher and how their learners learn as
A. controller
B. assessor
C. researcher
D. participant
What does the author mean by saying "The results suggested that cheating may be becoming
After the previous survey in 2013， more students are found cheating.
B. More cheating students were under the survey this time.
C. No measures are taken to manage the phenomenon of cheating.
D. Most students don"t pay attention to their curricula.
Which of the following belongs to the communicative approach？
A. Focus on accuracy.
B. Focus on fluency.
C. Focus on strategies.
D. Focus on comprehension.
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