单项选择题

The reason why NASA hopes to carry out at least two moon missions a year starting in 2018 is to （）

A．ensure the moon traveling and the moon base construction
B．speed up the moon base construction and other activities
C．guarantee the quality of the researchers' scientific study
D．set up new training laboratories for future missions to Mars

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单项选择题

What will be the astronauts' top priorities（）

A．Entering the orbit and landing on the moon.
B．Landing and walking on the moon surface.
C．Exploration and researches into the moon composition.
D．Exploration and construction of a moon base.

单项选择题

How will CEV and the moon lander be launched（）

A．They will be launched separately.
B．CEV will dock with the moon lander.
C．They will be launched together.
D．The moon lander will hold four astronauts.