给下面的句子加上恰当的标点符号。

1．激光是一种新型的光是人造的光它与太阳___电灯等发的光是不一样的___

2．他发现人们住在山洞里___饥寒交迫___他们被野兽捕食___甚至彼此猎食___他们实在是一切生物中最可怜的了___

3．___什么___他叫道___ ___好啊___我要用一种办法来狠狠地惩罚他___

4．这样___它就成为一把最快的___刀___了___

when the dispute over duty payment arises between the duty payer and the Customs, the duty payer should first pay the duty and then, within ______ days of the issuance of the duty memo, apply to the Customs in writing for a reconsidertation of the case.

A．10 days

B．20 days

C．30 days

D．50 days