哪些危险货物必须使用毒品专用车装运？

转换平价可以视为已将可转换证券转为标的股票的一个盈亏平衡点。（）

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中所给词语的正确形式填空。

American Idol is a TV show and annual American singing competition, which began its first season on June 11, 2002. It is based on the British show Pop Idol, in which thousands of young singers, aged 16-28, audition（试演）for the chance   小题1: (choose) as the new singing idol. The program seeks to discover the  小题2: (good) young singer in the country through  小题3: series of nationwide auditions.              

Auditions  小题4: (hold) in key cities around the country, with judges removing some contestants(选手),  小题5: there are only 30 left. These 30 compete, on air, and the viewing public votes for  小题6: three favorites each week, over the course of the next three weeks. Those nine contestants, along   小题7: one “wild card” chosen by judges, continue on to the next stage of the competition,  小题8: takes place over several weeks. The outcome of the latter stages of this competition is wholly determined by public voting. There are three judges assessing the contestants’   小题9: (perform) in order to facilitate(推动) the voting.

Of these ten, two winners are chosen to appear in a live half-hour telecast（电视广播）the following evening to compete   小题10: a top-dollar record deal.

热压铁块

机械波

预防叶螨，从春季开始，注意检查地面杂草及植株叶片上的叶螨，根据发生情况，及时成批防治或（）。

A、打药

B、杀虫

C、全面喷药

D、局部喷药