What took place on Sunday

A．Sharon declared that he would resign.

B．An Israeli woman and her daughters were killed by Palestinian gunmen

C．Some Likud members refused to cast ballots because of the killing

D．Sharon said that he would hold the referendum again despite his failure.

为了确保人体健康，需要吃些粗粮。玉米是营养成分丰富的优质粗粮，玉米中的主要成分见下表。

(1)上表中含有人体所需的营养素有____类。

(2)玉米经初加工可得到淀粉，淀粉属于____（填字母序号）。

A．蛋白质B．糖类C．油脂

(3)淀粉发酵可制得乙醇，乙醇属于____（填字母序号）。

A．最清洁能源B．不可再生能源C．可再生能源

(4)玉米芯与稀硫酸在加热、加压的条件下反应，可得到重要的化工原料糠醛。糠醛(C₅H₄O₂)充分燃烧只生成二氧化碳和水，写出此燃烧反应的化学方程式___________________。