题目

在平面直角坐标系xOy中，给出如下定义：若点P在图形M上，点Q在图形N上，称线段PQ长度的最小值为图形M，N的“近距离”，记为d(M，N)，特别地，若图形M，N有公共点，规定d(M，N)＝0．已知：如图，点A( ， 0)，B(0，)． （1） 如果⊙O的半径为2，那么d(A，⊙O)＝，d(B，⊙O)＝． （2） 如果⊙O的半径为r，且d（⊙O，线段AB）=0，求r的取值范围； （3） 如果C(m，0)是x轴上的动点，⊙C的半径为1，使d（⊙C，线段AB）<1，直接写出m的取值范围．缺词填空Do you remember how you get your English name? Your English teacher gave it to you or you looked up the d 1. to get it? Have you ever thought w2. your English name will bring you good luck or bad luck?A new study found a name that others felt difficult to pronounce might i 3. a person’s future The study shows that the e 4. your name is to pronounce, the more trustworthy（值 得信赖的）people will think you are.. The research also shows that people with more familiar（熟 悉的）names are probably to hold higher positions in s 5. . In other words, a weird（古怪的）name may prevent someone from going to be a 1 6. or a boss. You may think about your `'name again. If your first name sounds strange and you can't c 7. it, you can do as the following s8. .Try using a middle name if it's not hard to pronounce If you don't have a middle name, you can use a nickname（绰号）And when you get to the interview, you can e 9. that you often use a nickname because people find your r10. name difficult to pronounce.Your name may mean more than you think.