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【单选题】
(2019·湘潭)关于如图所示的民族吹管乐器唢呐,下列说法正确的是(D)
A.
吹奏时按压不同位置的气孔，主要改变了声音的响度
B.
用不同的力度吹奏，主要改变了声音的音调
C.
唢呐前端的喇叭主要改变了声音的音色
D.
唢呐发出的声音不能在真空中传播
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【单选题】England is not a big country: from north to south and from east to west it is only about three hundred miles across. (76) But for a small country it has a surprising range of climate. People who have ...
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【单选题】听力原文： New England is an area of mountains, valleys, and rivers. It is said that in New England one is always climbing hills. A large part of New England is also made up of farms and farming lands. Yet...
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It is completely flat.
B.
It has few rivers.
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It has many large lakes.
D.
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【单选题】England is not a big country: from north to south and from east to west it is only about three hundred miles across. But for a small country it has a surprising range of climate. People who have never...
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【单选题】听力原文： [32] New England is an area of mountains, valleys, and rivers. It is said that in New England [32] one is always climbing hills. A large part of New England is also made up of farms and farming ...
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【单选题】England is not a big country: from north to south and from east to west it is only about three hundred miles across. But for a small country it has a surprising range of climate. People who have never...
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