设函数f(x)=|x-a|+3x，其中a＞0， （Ⅰ）当a=1时，求不等式f(x 发布时间：2017-05-08 17:32 │ 来源：www.tikuol.com 题型：解答题 问题： 设函数f(x)=|x-a|+3x，其中a＞0，（Ⅰ）当a=1时，求不等式f(x)≥3x+2的解集； （Ⅱ）若不等式f(x)≤0的解集为{x|x≤-1}，求a的值．
题型：解答题 阅读理解。 What do you do to get pocket money from your parents? In Western countries, many children do housework to get pocket money. They usually start to do this at 10 years old. School students have to do homework and study for tests. They don't have a lot of free time in the week. They often do housework at the weekend. Young kids only do easy housework. So they don't get much money. But that's all right. Many of them only want to buy candy. And candy is cheap! They help wash up after dinner and feed the family cat or dog. When they get older, kids want to buy more and more thing. They want things that are more expensive than candy. Then they have to work harder! They often wash the family car, cut the grass, walk the dog or cook dinner. It is really a good way for kids to learn to do some new things. Of course, their parents will help them learn something at first. For example, parents often teach them how to cook before they can. 1. What does "pocket money" means in this passage?[ ]A. 口袋里的钱 B. 零花钱 C. 钱包 D. 储钱罐2. Children in Western countries usually help do the house work at the age of ________.[ ]A. six B. nine C. ten D. fifteen3. Before young kids go to middle school, what do they usually want to buy with their pocket money?[ ]A. Cats. B. Dogs. C. Cars. D. Candy.4. When do the kids often do the housework?[ ]A. On Saturdays and Sundays. B. On weekday. C. In class D. After dinner. 5. Which of the following sentences is NOT true?[ ]A. They can get much money if they wash the dishes after dinner. B. Their father or mother will help them learn to cook at first. C. They will get more money to walk a dog than to feed it. D. The kids are busy on weekdays. 查看答案
题型：解答题 以下有关女性性发育的描述正确的是A．内生殖器发育和 * * 发育 B．主要是卵巢和 * * 发育 C．月经来潮和 * * 发育 D．生殖器官发育、月经初潮和第二性征发育 E．外生殖器发育和 * * 发育 查看答案