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【单选题】
Ice is _____ than water because _____.A.
less dense; frozen water maintains more hydrogen bonds than liquid water
B.
less dense; liquid water maintains more hydrogen bonds than frozen water
C.
denser; frozen water maintains more hydrogen bonds than liquid water
D.
denser; liquid water maintains more hydrogen bonds than frozen water
E.
denser; frozen water cannot hydrogen bond
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B.
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D.
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A.
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B.
P resent testimony from qualified sources .
C.
U se examples to quantify ideas .
D.
U se statistics to personalize ideas .
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