_______he had failed many times, he didn't give up and succeeded in the end.
读拼音,写汉字。
shān
yě
cháng
rì chū
大____
____许
____江
____
下列加横线注音全都正确的一项是( )
当今社会食品安全问题日益突出,为防止食品腐败变质,应采取的保存方法有( )
①高温 ②低温 ③保持干燥 ④保持湿润 ⑤暴露空气中 ⑥隔绝空气.