The thrombus forms in a blood vessel or within the heart and obstructs the circulation.

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问题 The thrombus forms in a blood vessel or within the heart and obstructs the circulation.

选项 A、clot
B、mass
C、node
D、knot

答案A

解析 句意:血栓是在血管或心腔中形成的,阻碍循环的血凝块。thrombus血栓,血凝块。clot(血液等的)凝块。mass块,堆。node节点。knot(绳等的)结,(树的)节。
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