金银花入药的部位是（）
A.开放的花
B.花蕾
C.花粉粒
D.花序
E.花柱与柱头
参考答案：B
They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.
A．which; that
B．it; one
C．that; one
D．one; that
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