exciting可数吗?

　　An exam, or even an exciting social event may produce butterflies in thestomach.

　　一场考试，甚至是一次令人兴奋的社会活动，都有可能让人心里发慌。

　　This piece of equipment is an exciting new development.

　　这台设备是一项振奋人心的最新研究成果。

　　This is one of the most exciting developments in biology in recent years.

　　这是近年来生物学上令人振奋的发展之一。

　　The course offers a range of exciting possibilities for developing yourskills.

　　这门课程可提供一整套新鲜活泼的技能训练。