号称“非洲屋脊”的是（　　）

Hitchbot

    Have you ever seen a hitchhiker(搭便车的旅行者）standing by the side of a road? Now drivers in Canada might see____unusual hitchhiker; a hitchhiking robot.

    One of its inventors, David Harris Smith, has hitched across Canada three times. Smith and a friend, Frauke Zeller, have built Hitchbot because they wanted____(see) if people would stop and give the robot a lift and talk to it. The robot can chat about things it has learned, and about____(it) trip. You might think it's a joke,____Smith and Zeller's experiment has a serious point: can robots and people get along?

    Hitchbot____(begin) its journey in Nova Scotia in July. It has already completed a third of its 6,000-mile trip to Victoria. More than 57,000 people are following its journey____(close) on Facebook and Twitter, and travelers have posted lots of____(photo) on the websites. Hitchbot has also done some shopping, eaten motor oil, and had fun with travelers. Nobody knows____it will finish its journey. It might be____(long) than expected, but Zeller and Smith want Hitch to get____many rides as it can. It hasn't been in a self-driving car yet, but anything is possible!

二十世纪初，为研究物质的内部结构，物理学家做了大量的实验，如图装置的实验是（）

填写句子。

①但愿人长久，____。

②落霞与孤鹜齐飞，____。

③____，把酒问青天。

④人有____，月有____，此事古难全。