单项选择题

No one would have time to read or listen to an account of everything ____________going on in the world.

A．it is
B．as is
C．there is
D．what is
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单项选择题
Mercury's velocity is (so much) greater than (the Earth's) that it completes more than four revolutions around the Sun in the time (that) takes the Earth to complete (one).
A．so much
B．the Earth''s
C．that
D．one
单项选择题
I ____________with thanks the help of my colleagues in the preparation of this new column.
A．express
B．confess
C．verify
D．acknowledge
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