单项选择题

Questions 23 to 28 are based on the conversation you have just heard.

A．Flies need less sleep than humans.
B．Humans need a similar amount of sleep with flies.
C．The amount of human sleep is determined by certain gene.
D．Flies can determine how much sleep they nee
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单项选择题
A．They lose water constantly.B．They contain a relatively lower concentration of salt.C．They neither lose nor absorb water.D．They possess a relatively higher concentration of salt.
A．They lose water constantly.
B．They contain a relatively lower concentration of salt.
C．They neither lose nor absorb water.
D．They possess a relatively higher concentration of salt.
单项选择题
A．Apple.B．Energy Star.C．Sony.D．Microsoft.
A．Apple.
B．Energy Star.
C．Sony.
D．Microsoft.
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