货币供应量中M0是指（）。
A.定期存款
B.活期存款
C.银行体系中流通的现金
D.流通中的现金
参考答案：D
用所给词的适当形式填空。
1. You are never too old _______ (learn).
2. Lucy always spends her free time _______ (play) computer games.
3. Who is _______ (tall), Jim or Tom?
4. Don't forget _______ (buy) some books for me.
5. A lot of _______ (visitor) come to see the Great Wall every year.
生态文明建设的前提和关键是（）。
A.发展
B.开放
C.观念转变
D.以上都不是
