单项选择题

The author’s attitude towards the possibility of life on the Mars in the future is ()

A. doubtful
B. positive
C. negative
D. uninterested

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单项选择题
Which of the following would be the best title for the passage()

A. Husband-Wife Relationship
B. Women’s Rights
C. Laura’s Marriage
D. Family Violence
单项选择题
23()

A. including 
B. not to say
C. excluding   
D. such
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