单项选择题

The children listened ______ to the words of their father.

A．respectively
B．respectfully
C．respectantly
D．respectably
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单项选择题
______ complex organic catalysts originating in living cells.
A．Enzymes are
B．Enzymes while they
C．Enzymes
D．Enzymes which are
单项选择题
Work in parapsychology, ______, has attracted a rel atively small number of scientists.
A．is a very controversial field
B．a field very controversial which
C．which a very controversial field is
D．a very controversial field
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