[单选题]胰岛素分子A链和B链的交联是靠（　　）。
A.氢键
B.二硫键
C.盐键
D.疏水键

To develop a little the line of the poet Edmund Spenser, who in the sixteenth century wrote, " Sweet Thames run softly, till I end my song": it still runs softly enough but could never be called sweet in any gustatory{{U}} (1) {{/U}}. If its brown-black color{{U}} (2) {{/U}}sound sufficient warning we could, but will{{U}} (3) {{/U}}recalling the dreadful things that Thames oarsmen say a mere mouthful will do to anyone{{U}} (4) {{/U}}. Probably Spenser was using the word "sweet" in the sense of "dear" rather than of{{U}} (5) {{/U}}. Not necessarily though, for the river was still, a century after Spenser, clear enough for{{U}} (6) {{/U}}to dive into it from the terraces of their waterside mansions. However, Spenser would probably{{U}} (7) {{/U}}to learn that today the river is chemically in better shape than it has been for many years—a fact borne out by the{{U}} (8) {{/U}}of fish now to be found, and angled for, in the reaches