The heart beats about 100,000 times every 24 hours and pushes several quarts of blood through miles of arteries, veins and capil

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问题 The heart beats about 100,000 times every 24 hours and pushes several quarts of blood through miles of arteries, veins and capillaries. A healthy heart keeps this up for a lifetime without______.

选项 A、cease
B、faltering
C、halt
D、hesitation

答案B

解析 falter不稳,衰退。
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