采用讨论法，当学生说出自己的看法时，教师应及时明确态度。( )
A. 对
B. 错
Questions 15-18 are based on the following dialogue: What can be inferred about the man
A. He earns less than ＄15,000 a year.
B. He’s looking for a full-time job.
C. He thinks his rent is too high.
D. He plans to go back to graduate school.
设备选择方案评价的方法不包括( )。
A. 寿命周期成本评价法
B. 工程经济相关理论
C. 层次分析理论
D. 本量利分析法
When is Bob going home this afternoon
Around 3:00.
B. At 1:00.
C. At 2:00.
D. He is not sure.
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