NASA began planning for the first moon landing since 1972 when George Bush, the US president, announced his new plan for space exploration four years ago.

　　NASA has already talked about the design of the Orion spacecraft that will replace the old space shuttle fleet in 2010.

　　The plan for the moon base, however, is the first detailed explanation of how NASA intends to prepare for the first manned exploration of deep space and a possible Mars mission within 30 years.

　　Scientists also believe that the south pole on the moon contain rich natural gases such as the rare helium-3 that could be used as fuel for the generation of nuclear power. Besides, teams of astronauts living there for six months at a time would mine for hydrogen and oxygen to make water and possibly rocket fuel.

　　When was the plan to explore space first announced according to the passage?

　　A. In 1972.

　　B. In 1950.

　　C. In 1968.

　　D. In 2020.

　　The reasons why NASA has begun the plan to explore space include the followings Except ________.

　　A. to protect Earth

　　B. to explore deep space

　　C. to finish Mars mission D. to show how powerful the USA is

　　In the future, when people fly to the moon, they will probably not bring with them too much ________.

　　A. hydrogen

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