面粉、糖、灭鼠药混合的灭鼠毒饵

商业银行代保管的标的物必须是上海黄金交易所制定的中国8家黄金冶炼企业所生产的标金，或由商业银行出具黄金证明书、外形完整无损的黄金实物。（）

—The project has been held up by a sudden change in temperature for a week.

—I'm afraid the terrible weather will________for some time.[ ]

A. keep back  

B. keep up

C. keep out  

D. keep on

据史籍记载，妇女在额头涂黄是南北朝才流行起来的一种习俗。

梗丝线膨胀含水率要求为（）。