答案：A
题干意思：如果你能放松一点、自信一点，演讲时就不会结巴了。
[答案解析]
A. stumble 1 to make a mistake or mistakes and stop while you are speaking, reading to sb or playing music(不顺畅地)说，读，演奏
2to hit your foot against sth while you are walking or running and almost fall绊脚
The sudden weakness in her legs made her stumble.她突然两腿发软踉跄了一下。
B.jumble to mix things together in a confused or untidy way 使乱堆;使混乱;
The shoreline was made up of a jumble of huge boulders.这海岸线由一堆杂乱的巨石构成。
C.tumble to fall downwards, often hitting the
ground several times, but usually without serious injury; to make sb/sth fall in this way (使)跌倒，摔倒，滚落，翻滚下来
He slipped and tumbled down the stairs.他脚一滑滚下了楼梯。
D.rumble to make a long deep sound or series of sounds发出持续而低沉的声音;发出隆隆声
I hear the rumble of thunder in the distance.我听到远处雷声隆隆。
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