单项选择题

A．boundary
B．restriction
C．confinement
D．limit
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单项选择题
How can sharks find their quarries
A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.
单项选择题
How can the group carry out their studies
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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