题目

函数y=cos(sinx+2.2)的值域是（    ）A.［-1，1］                              B.［-1，cos1.2］C.［cos1.2,cos3.2］                        D.［cos3.2,cos1.2］ 答案：解析：设μ=sinx+2.2，则μ∈［1.2,3.2］，y=cosμ在［1.2,3.2］上的简图如图.由图象可知，当μ∈［1.2,3.2］时，值域y∈［-1,cos1.2］.故答案选B. 答案:BWhen you see a famous car in the street, maybe you will say, “It’s cool . ” You may think, “He’s so cool，”when you see your favourite footballer.We all maximize（扩大）the meaning of “cool”. You can use it instead of many words such as “ new ”or “ surprising ”. Here’s an interesting story we can use to show the way the word is used. A teacher asked her students to write about the waterfall （瀑布）they had visited. On one student’s paper was just the one sentence, “It’s so cool. ” Maybe he thought it was the best way to show what he saw and felt.But the story also shows a scarcity（缺乏）of words. Without “cool”, some people have no words to show the same meaning. So it is quite important to keep some credibility （可信性）. Can you think of many other words that make your life as colourful as the word “cool”? I can . And I think they are also very cool .1.We know that the word “ cool ” has had _________A.only one meaning B.no meaningsC.many different meanings D.the same meaning2.In the passage, the word “ express ” means “________”A.see B.show C.know D.feel3.If you are _____________ something, you may say, “It’s cool。”A.interested in B.angry aboutC.afraid of D.unhappy with4.The writer takes an example to show he is _________ the way the word is used.A.pleased with B.strange to C.worried about D.careful with5.In the passage, the writer suggests（暗示）that the word “ cool ” _______A.can be used instead of many wordsB.usually means something interestingC.can make your life colorfulD.may not be as cool as it seems