下列实验操作合理的是( ) A.实验室制乙烯时,在酒精和浓硫酸的混合液中,放入几片碎瓷片,加热混合物,使液体温度迅速升到170 ℃B.实验室制取肥皂时,待植物油、乙醇和氢氧化钠溶液的混合物加热充分反应后,冷却,用纱布滤出固态物质C.验证溴乙烷水解产物时,将溴乙烷和氢氧化钠溶液混合,充分振荡溶液、静置,待液体分层后,滴加硝酸银溶液D.验证蔗糖水解产物时,在蔗糖溶液中加入几滴稀硫酸,水浴5 min,加入新制银氯溶液
第二节短文改错(共l0小题;每小题l.5分,满分l5分)
此题要求改正所给短文中的错误。对标有题号的每一行做出判断:
如无错误,该行右边横线上画一个勾(√);
如有错误(每行只有一个错误),则按下列情况改正:
此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线
划掉。
此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。
此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。
注意:原行没有错的不要改。
Every year, students who are eager get home
for the Chinese 76.
New Year, line up at railway station for
hours. Then 77.
they got into a crowded train and dream of
the home – cooked 78.
meals what they’ll enjoy once they arrive
home. This, 79.
they say, make all the trouble of getting
home worthwhile . 80.
Therefore, many of them come to find home
is not exactly 81.
how they remember it. Live away from their
parents has 82.
made them used to a new life of freedom –
one that within 83.
hours of arriving some begin to miss.
Endless houseworks 84.
and complaining parents are just a little
of the things that 85.