单项选择题

Is it necessary to（） our body to the sunlight

A. reveal
B. display
C. expose
D. show

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Beyond （）stars, the astronauts saw nothing but（）space.

A. the, /  
B./,the    
C./,/  
D. the, the
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My brother is now working （） he did last year.

A. much harder than
B. more harder than
C. more than
D. much than
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