[解析]
(1)由My mother buys a nice dress. (我妈妈买了一条漂亮的连衣裙。)可知我妈妈的连衣裙很漂亮。故选:B。
(2)由And she buys a red shirt for me. (她还给我买了一件红色的衬衫。)可知我的妈妈给我买了一件红色的衬衫。故选:C。
(3)由Then in the vegetable store,we buy some tomatoes,green beans.and onions. (接着,在蔬菜店里,我们买了一些西红柿、绿豆和洋葱。)可知在蔬菜店里,我们买了一些西红柿、绿豆和洋葱。故选:B。
(4)由We don't need fruit,so we don't go to the fruit store. (我们不需要水果,所以没有去水果店。)可知她们没有去水果店。故选:B。
(5)由My mother buys a nice dress.It's 150 yuan.And she buys a red shirt for me.It's 80 yuan. (我妈妈买了一条漂亮的连衣裙。它是150元。她还给我买了一件红色的衬衫。它是80元。)可知她们花了230元买衣服。故选:C。