听下面一段短文，根据所听内容完成下面的填空（每空填一词）。

    …often on the weekends．These parties may be held to ____certain time like birthdays，end of the school year，____and the New Year…The person who invites guests usually servers simple ____and a small amount  of food．The children may spend the evening talking，listening to music and ____．In the US …to have parties without their parents being ____． Some parties …

有两只相同的烧杯，分别盛有体积相同的水和酒精，但没有标签，小李采用闻气味的方法判断出无气味的是水．小唐则采用压强计进行探究：

科学家利用基因工程培育出了耐盐的转基因水稻新品系。下有关叙述错误的是