单项选择题

All living organisms, regardless of their unique identity, have certain biological, chemical, and physical characteristics in common.

A. as result of
B. considering
C. on purpose
D. whatever
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We all think that Mary's husband is a very boring person.
A. shy
B. stupid
C. dull
D. selfish
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Nowadays, we can purchase things on-line.
A. read
B. buy
C. rent
D. watch
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