如图，已知矩形ABCD的长AB为5，宽BC为4，E是BC边上的一个动点，AE⊥EF，EF交CD于点F．设BE=x，FC=y，则点E从点B运动到点C时，能表示y关于x的函数关系的大致图像是（   ）

如图是DNA片段的结构图，请据图回答：

阅读下面诗，完成小题。
                                                                                                                                     饮湖上初晴后雨
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                                                                                                                   水光潋滟晴方好，山色空蒙雨亦奇。
                                                                                                                   欲把西湖比西子，淡妆浓抹总相宜。