单项选择题

The energy gained from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.

A．precede
B．proceed
C．progress
D．practice
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This detective story might not be ______ interesting to keep the child awake.
A．enough
B．adequately
C．amply
D．sufficiently
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It will rain, ______ the barometer is falling.
A．so
B．for
C．as
D．since
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