单项选择题

A．Earthquake.
B．Turbidity currents.
C．Erosion and the deposit of sediment on the deep sea floor.
D．Waves or currents that deep in the ocean.
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单项选择题
A．Customs officer and traveler.B．Shop assistant and customer.C．Repairman and customer.D．Postman and customer.
A．Customs officer and traveler.
B．Shop assistant and customer.
C．Repairman and customer.
D．Postman and customer.
单项选择题
DNA fingerprinting can be unreliable when ______.
A．the methods used for blood-cell calculation are not accurate
B．two different individuals of the same ethnic group may have the same DNA fingerprinting pattern
C．a match is by chance left with fingerprints that happen to belong to two different individuals
D．two different individuals leave two DN samples
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