请问三个问题：1.they really right away. 的意思是什么，hit it off 是什么意思？
2.Essential a nineteenth-century instrument, the calliope was usually played outdoors and was a part of fairs, holiday gatherings, and other such activeties. 哪个是错的，应如何改。答案是essential.
3.Xanthines have both good and bad effects on the body, and these effects are generally determined on the size and regularity of dosage. 哪个是错的，应如何改？答案是determined作者: 猫猫头 时间: 2003-4-18 22:18
if should use determine rather than determined, then the verb "are" is redundent. so, i don't think determine is correct. what' your opinion?作者: 猫猫头 时间: 2003-4-19 18:51
