Ebbysemeyer estimates that a thousand containers of cargo fall into the sea from ships every year. His data suggest that some of those items can remain adrift for years before washing shore. He cites the case of an unknown Nike sneaker that washed ashore in Washington after floating for three years in the Pacific Ocean. It was still quite wearable, said Ebbysemeyer.
31.What happened to those hockey gloves that fell overboard?
A. They were retrieved by the crew.
B. Some of them reached shore at last.
C. They sank to the seafloor.
D. They were completely lost in the vast ocean.
32.Why does Ebbysemeyer study ocean currents?
A For pragmatic purposes.
B For fun.
C Just out of curiosity.
D To study the lives of plankton.
33.All the factors that affect ocean currents are discussed in the passage EXCEPT ___________.
A the suns heat
B rotation of the earth
C gravitational force
D windage
34.What creates deep ocean currents?
A High temperatures near the equator.
B Magnetic force near the South Pole.
C Magnetic force near the North Pole.
D Low temperatures near the two Poles.
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