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(五) Space travel is definitely bad for astronauts’ bones, reducing their bone density after only a ...

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reached    was reached    has reached    had been reached  
How    That    What    Who  
Travelled    Travel    Travels    Travelling  
search for    look for    search    discover  
A. the; the    the; /    /; /    /; the  
ravel  travelled   to travel    being travelled  
to travel    traveling    to be traveling    travel  
is called; was designed    called; designed    is called; designing    called; was designed  
what    which    不填    it that  
reached   was reached   has reached   had been reached  
a; the    the; the    the; a    a; 不填  

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