第17题: [单项选择]What do we learn about prisoners in Britain A. They are encouraged to do maintenance for the training centre. B. Most of them get paid for their work. C. They have to cook their own meals. D. They can choose to do community work. 参考答案:B
第18题: [单项选择]下列关于咯血的特点,错误的是() A. 咯血之前多有胸闷、咳嗽等症状 B. 咯血的颜色常为鲜红色 C. 咯血中常混有泡沫 D. 咯血患者多无黑便 E. 咯血多为酸性 参考答案:E