题目

定义在R上的偶函数f(x)满足：对任意x1，x2∈[0，＋∞)(x1≠x2)，有<0，则( ) A．f(3)<f(－2)<f(1)                 B．f(1)<f(－2)<f(3) C．f(－2)<f(1)<f(3)                 D．f(3)<f(1)<f(－2) 答案：解析：对任意x1，x2∈[0，＋∞)(x1≠x2)，有<0，实际上等价于函数f(x)在[0，＋∞)上是减函数，故f(3)<f(2)<f(1)，由于函数是偶函数，故f(3)<f(－2)<f(1)． 答案：A阅读下面短文，从A-F中找出符合各段意思的小标题，其中一项为多余选项。 A. Let them in your lifeB. Do more jobs around the houseC. Have fun togetherD. Express your loveE. Say more “yes”F. Show your kindness and respectHere are some advice for you to get on well with your parents.1.____________________.Tell them how things are going for you， even if it’s a small thing. You can share something about your school and friends every day with them. You can also talk to them about your troubles. They may have advice.2._____________________.Find things you all enjoy and do them together. You’d better leave your computer games and spend more time with them.3._____________________.Always respect your parents even when you disagree with them. Don’t be angry or shout to them.4._____________________.You probably want your parents to do that， too. Parents are more likely to agree with you and say “yes” when kids are cooperative.(配合的)5._____________________.Consider doing something special for your parents on their birthdays. You can tell them you love them by trying a hug， a note， a kiss， or a simple thank-you.