The carrier rocket sent a Shenzhou-ll spacecraft（航天器）with astronauts Chen Dong and Jing  Haipeng into space. The rocket was fired from the Jiuquan Satellite Launch Center____the Gobi desert. After two days in Earth's orbit, the spacecraft____(be) to link up with China's space  laboratory, called the Tiankong-2,____name means“Heavenly Palace 2". The lab ____ (place) into orbit last month.

    The astronauts will spend 30 days on the Tiankong-2. They plan to perform ____ (science) and spacecraft-related experiments and test systems for a future space station. In____words, the Tiankong

    2 laboratory will not be part of that space station. Its main goal is to practice the techniques and the____(technology) that they will be ____(use)to build and operate that final space station.

    It is predicted that the Chinese space station will be built mostly by machine. China hopes to have the space station____ (complete) by 2022 and it is expected to operate for at least 10 years.

    China also plans to land a probe（探测器）on Mars by 2020. Until now, China has completed a total of five manned space missions. And, in 2003,it ____ (successful)landed a probe on the moon.

古诗文填空。

①李白的《闻王昌龄左迁龙标遥有此寄》中将月亮人格化，无知的明月成了善解人意的知心人的一组诗句是：____，____ 。

②孔子论述学习与思考关系的句子是：____，____ 。

③《次北固山下》描写时序交替，暗示时光流逝，蕴含自然情趣的句子是：____，____。

④《钱塘湖春行》一诗中，从植物的变化来写早春景象的诗句是：____，____。

证明：直角三角形斜边的中线等于斜边的一半。