Nowadays, the athletes' expenses are paid for ______.
A.by contributions
B.by the athletes themselves
C.out of the prize money of the winners
D.out of the funds raised by the competing nations
第4题
实现肺通气的组织器官是 【 】
A.肺泡
B.呼吸道
C.胸廓
D.呼吸道与肺泡
E.呼吸道、肺泡和胸廓
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