货币要成为普遍接受的交换媒介，必须具备两个基本条件：一是（）；二是（）。
参考答案：立法保障、公众的信心
用所给词的适当形式填空。
1. If you don't work hard, you can't be a computer _____ (program).
2. I think it's a good idea to go _____ (swim) in the rivers and lakes in summer.
3. I want to work for _____ (me) when I am rich enough.
4. The kids _____ (not) go to school now if it is raining too hard tomorrow.
5. She had _____ (little) money to spend this time, because her father lost his job two weeks ago.
根据《药品包装、标签和说明书管理规定(暂行)》，药品包装上通用名称与商品名称用字比例不得小于( )
A．1:1B．1:2C．1:3D．1:4E．1:5
