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材料一：我国内陆土地总面积约144亿亩，居世界第三位。但我国人均占有土地面积约为12亩，不到世界人均水平的三分之一。而且，我国土地资源相对贫乏，土地质量较差。 材料二：几年来沈阳市为解决“经济制约环境、环境阻碍经济的城市顽疾”，采取了经济发展与环境改善并驾齐驱的办法，在工业产值快速增长的同时，环境质量也在不断改善。沈阳市累计投入城建资金300多亿元，开展大规模的城市绿化、道路建设、水系建设、城市污水和垃圾处理The first robot rover to land on the Moon in nearly 40 years, China's Jade Rabbit, has begun sending back photos, with shots of its lunar lander(登月飞行器). Jade Rabbit rolled down a ramp lowered by the lander and on to the volcanic plain known as Sinus Iridum at 04：35 Beijing time on Saturday (20：35 GMT)．It moved to a spot a few metres away, its historic short journey recorded by the lander. On Sunday evening the two machines began photographing each other. A Chinese flag is clearly visible on the Jade Rabbit as it stands deployed on the Moon's surface.Ma Xingrui, chief mander of China's lunar programme, declared the mission (任务)a “plete success”. The first soft landing on the Moon since 1976 is the latest step in China's ambitious space programme, says BBC science reporter Paul Rincon. The lander will operate there for a year, while the rover is expected to work for some three months. The Chang'e­3 mission landed some 12 days after being launched atop a Chinese­developed Long March 3B rocket from Xichang in the country's south. The official Xinhua news service reported that the lander began its descent(下降)on Saturday just after 13：00 GMT, touching down in Sinus Iridum (the Bay of Rainbows) 11 minutes later. “I was lucky enough to see a prototype rover(原型月球车) in Shanghai a few years ago ­ it's a wonderful technological achievement to have landed，” Prof Andrew Coates, from UCL's Mullard Space Science Laboratory, told BBC News. Chang'e­3 is the third unmanned rover mission to touch down on the lunar surface, and the first to go there in more than 40 years. The last was an 840kg (1,900lb) Soviet vehicle known as Lunokhod­2, which was kept warm by polonium(钋)­210. But the six­wheeled Chinese vehicle carries a more sophisticated payload(复杂的有效负荷), including ground­penetrating radar which will gather measurements of the lunar soil and crust.【小题1】What does the text mainly talk about?A．China's space and aeronautics industry develops quickly.  B．The importance of China's space and aeronautics industry. C．China's Jade Rabbit Moon rover sends back first photos. D．Chang'e­3 is the third unmanned rover mission to touch down on the lunar surface. 【小题2】After ________ years' hard and scientific work, the first soft landing on the Moon has made such great progress.A．nearly 40 B．37 C．64 D．more than 40 【小题3】The purpose that the Chinese moon rover has visited the moon is to ________.A．do some research about the moon B．be the first settler on the moon C．to plant the Chinese flag onto the moon D．send a lovely jade rabbit onto the moon 【小题4】From the text, we know that the lander began its descent on Saturday just after ________ Beijing time.A．13：00 B．20：00 C．22：00 D．21：00