往保温瓶里灌开水时，听声音就能判断壶里的水位高低，因为

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往保温瓶里灌开水时，听声音就能判断壶里的水位高低，因为（）

A：随着水位升高，音调升高

B：随着水位升高，音调逐渐降低

C：灌水过程中音调保持不变，响度增大

D：灌水过程中音调保持不变，响度减小

上一题下一题 0.0难度选择题更新时间:2018-12-05 10:36:52

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B

同类题4

阅读理解。

My name is Lily. I'm eight years old. This is my sister. Her name is Lucy. We are twins(双胞胎).Our hair is brown. Our eyes are blue. We look the same(一样), but I like pink. My T-shirt is pink. My shorts are white. Lucy likes orange. Her T-shirt is orange. Her shorts are black. I have a green schoolbag. Lucy's schoolbag is brown.

Lily		Lucy
hair	brown	①____	brown
②____	blue	eyes	blue
T-shirt	③____	T-shirt	④____
shorts	⑤____	shorts	⑥____
schoolbag	⑦____	schoolbag	⑧____

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