A、Mercury, Venus
B、Asaph,Hall
C、Phobos, Deimos
D、Romeo, Juliet
A、It has be heavy to prevent astronauts from floating away
B、It must also work as a SCUBA device
C、It needs to double as a hovercraft
D、It must be lightweight and easy to mover in
A、Olympus Mons
B、Mount Everst
C、Mons Huygens
D、Vinson Massif
A、crust
B、mantle
C、core
D、center
A、atomsphere
B、oceans
C、ice
D、sand
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