三思科技:There is an orange juice in the bottle.正确句子为什么要去掉an

There is an orange juice in the bottle.正确句子为什么要去掉an Is that an orange ?怎么回答？(肯定，否定) an orange的发音？ There is an assortment of styles and colors. 介词填空：Is there an old woman ( )the river There is an introduction of the contect in every book. There is an island in the m______ of the lake. 'W'is ( )lettle in the alphabet. There are minutes in an hour . "There _____ an apple and some oranges"横线上填is还是are? 哪里能找到there is an end这首歌的下载链接？