单项选择题

A．To tell the crab what time it is.
B．To protect the crab from the sunlight and enemies.
C．To keep the crab warm.
D．To be of no real use.
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单项选择题
Saccharomyces can stand far higher concentrations of ethanol than other microorganisms.
A．Y
B．N
C．NG
单项选择题
A．Waters off a level coast.B．The forest areas near the sea.C．The areas near the mouths of rivers.D．Both A and C.
A．Waters off a level coast.
B．The forest areas near the sea.
C．The areas near the mouths of rivers.
D．Both A and C.
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