单项选择题

(In) warm-blooded animals, their body temperature, regardless of the temperature of the animals' (surroundings), (are) maintained within narrow (limits).

A. In
B. surroundings
C. are
D. limits
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单项选择题
The discussion was so prolonged exhausting that ______ we had to stop for refreshments.
A．at large
B．at ease
C．at random
D．at intervals
单项选择题
Although we tried to concentrate on the lecture, we were ______ by the noise from the next room.
A．distracted
B．displaced
C．dispersed
D．discarded
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