单项选择题

A．The unusual habits of the centenarians.
B．How to live to be 100
C．The incredible groups of senior citizens.
D．How to be young forever
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单项选择题
A．They are trying to find another planet for human beings to live on.B．They are looking for fossils on Mars.C．They are sending robots to Mars.D．They are digging underground the Mars.
A．They are trying to find another planet for human beings to live on.
B．They are looking for fossils on Mars.
C．They are sending robots to Mars.
D．They are digging underground the Mars.
单项选择题
A．They are a group of astronauts.B．They are several scientists who are interested in the moon.C．They are a group of scientists and engineers who study Mars.D．They are NASA staff.
A．They are a group of astronauts.
B．They are several scientists who are interested in the moon.
C．They are a group of scientists and engineers who study Mars.
D．They are NASA staff.
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