单项选择题

All the lights in the house are _________ in the draught from the opening window.

A．floating
B．fluttering
C．wavering
D．flickering
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_________ the rhinoceros is carefully protected, it will soon go the way of other extinct spe- cies.
A．If
B．Therefore
C．As long as
D．Unless
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_________ some mammals came to live in the sea is not known.
A．Which
B．Since
C．Although
D．How
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