第10题: [单项选择]Without air protection, the sun's rays______. A. will become very cold B. will do good to human beings C. will become hot D. will do harm to human beings 参考答案:D 答案解析:[解析] 细节题。根据文章第三段最后一句We would be forced to seek shelter from the Sun,as there would be no atmosphere
第28题: [单项选择]The streets are all wet. It ______ last night. A. must be raining B. must have been raining C. had to rain D. must have rained 参考答案:D 答案解析:[解析] 该句是对过去事实的肯定推测。“must have done”结构表示对过去事实的推测,但只用于肯定句中,如果是否定句,应用“cannot”或“couldn't”,而不是“must not”。