A、
It can be found in both plants and animals.
B、
It can be found only in human beings.
C、
It cannot be found in one-cell creatures.
D、
It cannot be found in plants growing underwater.
【正确答案】
A
【答案解析】
A、
They stay awake all day long in summer.
B、
They work 24 hours every day in summer.
C、
They spend 12 hours sleeping every day in winter.
D、
They spend much time with families in winter.
【正确答案】
D
【答案解析】
A、
Sleeping from 8:00 p.m. until sunrise.
B、
Sleeping from 8:00 p.m. to 2:00 a.m.
C、
Sleeping twice with meditation at the end.
D、
Sleeping twice with in-between meditation.
【正确答案】
D
【答案解析】
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