第13题: [单项选择]The project required ten years of {{U}}diligent{{/U}} research. A. hardworking B. basic C. social D. scientific 参考答案:A 答案解析:[解析] 划线词为形容词,意思是“勤奋的”,与A项hardworking(刻苦的,努力的)意思相近,又如:Chinese people are hardworking.中国人民是勤劳的。B项意为“基本
A. The survivors are a brother and sister. B. They have been trapped in a kitchen. C. They have had enough food and water to survive. D. Both B and 参考答案:D