How can sharks find their quarriesA．By good sense

单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.

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.