单项选择题 人体最重要的散热途径是( ) A．皮肤 B．肌肉 C．肺 D．肾 E．肠道

单项选择题 The work ______ in two days. A．has been finished B．will finish C．will be finished D．are finished

单项选择题 It was the first time she ______ at a summer school and she enjoyed it greatly. A．was B．has been C．had been D．is