单项选择题

A．tiring
B．tired
C．tireless
D．worn
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单项选择题
Why do XXXX-making beds need protection from the sun’s rays
A．They are active during daylight hours.
B．Their heads are exposed to sunlight while they sleep.
C．They have only partially adapted to their tropical environment.
D．Their wings are easily damaged by ultraviolet radiation.
单项选择题
Besides their source of energy, what is major difference between archaean and bacteria
A．Their genetics.
B．Their size.
C．What they look like.
D．The amount of energy they need.
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