商品期货
参考答案：
是指买卖双方在有组织的交易所内，以公开竞价的方式达成协议，约定在未来某一特定时间交割标准数量特定商品的交易合约。
首字母填词。
1. A good a________ may have a right size and fit body.
2. Our team is strong enough to win the c________ next week.
3. My elder brother e________ the Army (军队) and became a soldier last year.
4. He is a t________ basketball player.
5. Amadeus Mozart was a great p________, he wrote a great deal of music.
湖泊的成因类型有哪些？
