【题目】While working outdoors, Tom was ________ by the heat and fell to the ground, unconscious.
A.hit
B.defeated
C.overcome
D.burst

【答案】C
【解析】句意：在户外工作时，汤姆受不了酷热，倒在地上不省人事。hit”打，打击， 打击“；defeat”战胜，击败“；overcome”战胜，制服，使受不了“；burst”爆发，炸破“。可知选C。