The main idea of the passage is about ______. Why does a tuner often stand in the wings?

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问题 The main idea of the passage is about ______.
Why does a tuner often stand in the wings?

选项 A、So it can be reached any time.
B、It is so designed mechanically.
C、So it can prevent moisture.
D、The piano needs to be tuned frequently.

答案D

解析 本题为细节题。问为什么琴翼上总放着一个调音器。短文第五段最后一句说,通常琴翼上总放着一个调音器,以便演奏时及时调整。答案选项与该信息一致,故为正确选项。
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