单选题Heavy fuel oils when spilled are（）.Amore harmful to sea life than lighter oilsBeasier to clean up than lighter refined oilsCless harmful to sea life than lighter oilsDnot a real threat to marine life
单选题
Heavy fuel oils when spilled are（）.
A
more harmful to sea life than lighter oils
B
easier to clean up than lighter refined oils
C
less harmful to sea life than lighter oils
D
not a real threat to marine life
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