题目

（07年全国卷Ⅰ理）从班委会5名成员中选出3名，分别担任班级学习委员、文娱委员与体育委员，其中甲、乙二人不能担任文娱委员，则不同的选法共有_____种。（用数字作答） 答案：答案：36解析：从班委会5名成员中选出3名，分别担任班级学习委员、文娱委员与体育委员，其中甲、乙二人不能担任文娱委员，先从其余3人中选出1人担任文娱委员，再从4人中选2人担任学习委员和体育委员，不同的选法共有种。Signs and notices are common to see in our daily life. Look at these!【1】Sign 1 means ________.A.the owner is illB.they look for helpC.they don't work right now【2】From the signs above, we can't learn that ________.A.the second sign is mainly for driversB.the 3 signs are all about people's healthC.the third sign is probably put up on a gate of school