第6题: [单项选择]关于主动脉的说法最正确的是（） A. 主动脉升部和降部 B. 主动脉弓和腹主动脉 C. 主动脉升部和胸主动脉 D. 主动脉升部、主动脉弓和主动脉降部 参考答案:D
第7题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. They are self-evident. B. They are yet to be proved. C. They are to be further studied. D. They are supported by scientific evidence. 参考答案:D 答案解析:[听力原文]
What call be learnt about the health benefits of exercise from the passage
[解析] [B]、[C]意
第29题: [单项选择]24 China has the world's largest telecom subscriber base, ______ . A. with almost 500 million mobile phones B. with almost 500 million fixed-line phones C. with almost 500 million subscribers of both fixed-line and mobile phones 参考答案:C 答案解析:第一段中提到：“China has the world's largest telecom...mobile subscribers "C项符合。
