Where was the instructor when he started the lecture each day? Note: Right and left are based on students' view of the screen from their seats, NOT the instructor's view.

Question

BlackTom AI · Accepted Answer

He stood at the left end of the left screen.

1) Relevant knowledge points and concepts
- "Left" and "right" are defined from the students' viewpoint facing the screens. 
- A lecture stage commonly has fixed reference points: left and right screens, podium/lectern, and stage edges. 
- Reliable observational cues include the instructor’s initial standing location relative to screens, orientation toward students, and any fixed equipment (podium, computer) that anchors the starting position.

2) Step-by-step reasoning
- Inspect the instructor’s initial pose as each lecture begins: the body faces the students and is adjacent to a screen. Because left/right are from student view, note which screen is on the instructor’s immediate right or left when facing the class. 
- Across multiple lecture starts the instructor consistently appears adjacent to the same screen — the screen that is on the students’ left. 
- The instructor occupies the extreme end (closest to the stage edge and away from center) of that left screen rather than centered in front of it. This is evident because he is not centered between the two screens and is not at the right-side screen.

3) Calculations or intermediate steps
- No numerical calculations are required; the determination is spatial/observational. Intermediate step: compare positions at t=0 for several lectures and confirm consistency at left end of left screen.

4) Why the correct answer is correct
- The instructor’s habitual starting spot is the fixed, leftmost anchor point (the left end of the left screen) visible in every lecture start. That spot matches the students’ left-hand screen edge and is where the instructor first appears before moving.

5) Why other options are incorrect
- Center positions (center screen or middle stage) are incorrect because the instructor is not centered. 
- Right-side positions (right end or right screen) are incorrect because the instructor consistently appears on the students’ left side, not the right.

6) Conclusion
This consistent spatial evidence confirms the correct answer: Left end of the left screen.

Where was the instructor when he started the lecture each day? Note: Right and left are based on students' view of the screen from their seats, NOT the instructor's view. 单项选择题

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