单项选择题

Once thought doomed to extinction, southern sea otters are now stringently protected through the efforts of naturalist groups.

A．rigorously
B．minimally
C．federally
D．guardedly
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单项选择题
The Weddell seal of Antarctica can dive to a depth of about, 1,600 feet and remain submerged for as long as an hour and ten minutes.
A．underwater
B．fearless
C．unconscious
D．breathless
单项选择题
Fortified medieval towns were often surrounded by two water moats.
A．protected
B．encircled
C．flooded
D．supplied
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