问题
选择题
They form a polar molecule, that is, ________ with a slightly positive end and a slightly negative end. [ ]
A. it
B. that
C. this
D. one
答案
答案：D
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They form a polar molecule, that is, ________ with a slightly positive end and a slightly negative end. [ ]
A. it
B. that
C. this
D. one
答案：D