单项选择题

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．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.
单项选择题
A．He relaxes.B．He goes fishing.C．He goes to work.D．He works at home.
A．He relaxes.
B．He goes fishing.
C．He goes to work.
D．He works at home.
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