单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．560-1287.
B．560-1828.
C．560-2187.
D．560-1288.
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单项选择题
A．2: 30p. m.B．3: 30p. m.C．4: 30p. m.D．5:00p. m.
A．2: 30p. m.
B．3: 30p. m.
C．4: 30p. m.
D．5:00p. m.
单项选择题
What is the main function of cyanobacteria
A．To make more dust storms.
B．To keep the soil flying.
C．To keep the soil to the ground.
D．To create more rocks.
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