根据短文内容判断下列句子正误。
    My name is Amy. Tomorrow is Saturday. My parents aren't going to work, but we are going to be very busy tomorrow. My mother is going to buy something. I'm going to the bookstore in the morning. Then I'm going to buy a dictionary.
    Tomorrow evening we are going to visit my grandparents and have a big dinner. After that we are going to the cinema. I think we are going to have a nice weekend.

活学活用化学知识：用化学用语表示：

因为 $\frac{1}{2}$ =50%，所以 $\frac{1}{2}$ 千克也就是50%千克．

用三种不同的培养基(1mL)培养大肠杆菌,培养36小时后获得的结果如下。能说明维生素可以促进大肠杆菌生长的是（     ）

培养皿	培养基	培养皿上的菌落数
I	琼脂、糖类	35
Ⅱ	琼脂、糖类、维生素	250
Ⅲ	琼脂、维生素	0

破解农产品“卖难买贵”顽疾，成了2012年中央“一号文件”提出的要解决的问题之一。以下措施有利于解决该问题的是