(A) 根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。

小题1:It was raining ____________ (heavy) at this time yesterday.

小题2:They looked at our pictures, but they didn’t show us ___________ (they).

小题3:_________ (silent) in the classroom makes everyone nervous.

小题4:My grandfather is in his _________ (sixty), but he is very crazy about pop music.

我国某企业计划于年初发行面额为100元、期限为3年的债券200亿元。该债券票面利息为每年5元，于每年年末支付，到期还本。该债券发行采用网上向社会公众投资者定价发行的方式进行。

根据发行价格与票面面额的关系，债券公开发行可以分为（）发行。

A．折价 

B．溢价 

C．平价

D．竞价