A. Yes, of course B. That's right C. Sorry, I'm not sure D. Sorry, I'm afraid not 答案：D
【解析】情景对话。由后句“只是从上午8点到下午4点”，前句意为“对不起，我恐怕不是的”，因此选D。
【2011 兰州】40. The population of the world still now.
A. will; grow B. has; grown C. is; growing D. is; grown
答案：C
【解析】现在进行时态的用法。句意“现在世界的人口数量还在不断增长”，因此选C。
【2011 兰州】三、完形填空 (共10小题，每小题1分，满分10分)
One day at the end of the class, a wise teacher told each of her students to a plastic bag and a bag of potatoes to school.
The next day she told her students: “From today on, for every person you don't like in your lives, you can choose a potato, write the person's name and the date it and then