小明在探究“凸透镜成像的规律”过程中，发现距离凸透镜20cm的光屏上得到一个清晰的与物体等大的像，则该凸透镜的焦距为____cm，物体向透镜靠近4cm时，所成像的性质是____的实像．假如用它观看邮票上的细微部分时，为了使看到的字更大，应将透镜____（靠近、远离）邮票．

根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Mrs. Lee: Hello. 68178502.
David:  Hello.____  ?
Mrs. Lee: Sorry.____ . Can I take a message?
David:  Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently. ____  . I don’t care if they were made of different metals. I just want to add some more coins in my collection.
Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?
David:  Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning?
Mrs. Lee: Sure.____ ?
David:   Oh, sorry.____   The new number is 66129853.
Mrs. Lee: OK. I’ll write a message for him.
David:   It’s really nice of you, Madam. Thank you very much. Goodbye!
Mrs. Lee:  Bye!

今年是香港回归祖国20周年，以下关于香港顺利回归的历史意义的表述，不正确的是（    ）

阅读下面的诗歌，完成下列各题。

如梦令•春思

北宋苏轼

手种堂前桃李，无限绿阴青子。

帘外百舌儿^①，惊起五更春睡。

居士，居士^②。莫忘小桥流水。

     【注释】这首词是苏轼离开黄州多年后，回想起当年的生活情景而写的。①百舌儿：鸟名；②居士：苏轼自号“东坡居士”，这里是作者的自称。