单项选择题

They send information every week, ______ whether its useful or not.

A. in consideration of
B. irrespective of
C. with the exception of
D. with regard to
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单项选择题
The average wavelength of visible light is 2,000 times ______ the diameter of an atom.
A. much as
B. greater than
C. as great
D. more than that
单项选择题
The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last May.
A. has been launched
B. having been launched
C. being launched
D. to be launched
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