In Nick’s opinion, why didn’t his relatives meet him at the airport A. They missed the flight. B. They were busy. C. Their car broke down. D. They were caught in the traffi 参考答案:D 答案解析:文中提到“Nick thought they had been caught in the heavy Roman traffic mentioned in the letters”。
第27题: [单项选择]隧道工程的主体结构物通常指( )。 A. 洞内行车道路 B. 洞身预支护与衬砌 C. 洞身衬砌和洞门构造物 D. 防排水构造物 参考答案:C 答案解析:公路隧道结构构造,由主体构造物和附属构造物两大类组成。主体构造物通常指洞身衬砌和洞门构造物,附属构造物是主体构造物以外的其他建筑物,是为了运营管理、维修养护、给水排水、供蓄发电、通风、照明、通信、安全