单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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单项选择题
A．At class.B．Back at home.C．At work.D．In hospital.
A．At class.
B．Back at home.
C．At work.
D．In hospital.
单项选择题
A．Call on people to protect sharks.B．Point out the living environment of sharks.C．Explain why the sharks are dangerous.D．An introduction to sharks.
A．Call on people to protect sharks.
B．Point out the living environment of sharks.
C．Explain why the sharks are dangerous.
D．An introduction to sharks.
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