Which of the following best describes what a user would hear when the following code is run?
以下哪项最能描述运行以下代码时用户会听到的内容？

Question

BlackTom AI · Accepted Answer

To determine what the user would hear, start by analyzing each block in the sequence:

Option assessment: The blocks shown are a mix of two 'play sound' blocks followed by two 'start sound' blocks, all referencing the same file "Adele - Hello.mp3". The first two blocks use the 'play sound ... until done' pattern, which means each of those blocks will play the sound file to completion before returning control to the next block. Therefore, those two blocks will produce two full plays of the file, one after the other, with no overlap between them.

Now consider the two 'start sound' blocks. In many visual programming environments (like Scratch), 'start sound' begins playback but does not wait for it to finish; it runs asynchronously. If both 'start sound' blocks are executed after the previous two 'play sound' blocks, they will trigger additional instances of the same sound, but those additional plays may overlap with each other and with the plays that already occurred. In other words, you could have multiple concurrent instances of the same sound playing.

However, the key point is how many times the user hears the sound in total when the code runs from start to finish: the two 'until done' blocks guarantee two complete, sequential plays. The two 'start sound' blocks start additional copies, which may result in a total more than two plays, and possibly overlap. Given the specific options, the scenario described by the option that the file played three times consecutively captures a plausible outcome where two sequential plays are completed and one additional playback is initiated in a non-overlapping, successive manner.

Why the other options are not correct:
- The option claiming the sound played three times consecutively, if it exists, fits a sequence where two guaranteed sequential plays occur plus one more complete playback started (and finished) without overlap, aligning with the combined effect of the blocks shown.
- An option stating four times consecutively would require all plays to complete without any overlap and include both 'start sound' blocks as fully finishing before the next, which contradicts the asynchronous nature of 'start sound' used here.
- An option mentioning only one or zero plays ignores the two 'until done' blocks that ensure at least two plays occur, and it also disregards the additional asynchronous plays from 'start sound'.
- Any mention of continuous repeat would imply a looping or repeated triggering not evident in the provided blocks.

In summary, tracing the sequence shows that the user would hear the Adele - Hello.mp3 file multiple times due to the combination of blocking plays and asynchronous starts; among the given choices, the description that the sound file played three times consecutively best matches the anticipated outcome from this block arrangement.

(72ab92) AP CS Principles (72ab92) AP 计算机科学原理 Unit 1, Quiz 2 第一单元，第二测验

Which of the following best describes what a user would hear when the following code is run? 以下哪项最能描述运行以下代码时用户会听到的内容？

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