下列能构成一个生态系统的是[ ]
A．东昌湖及湖内的所有生物
B．冠县万亩梨园内的全部梨树
C．聊城植物园内的所有荷花
D．聊城姜堤乐园内的所有植物
答案：A
根据提示或句意，补全句子。
1. I like s___________ best. It's warm.
2. W___________ is cold, but I like it.
3. I often go ___________ (swim) with Jack.
4. What's ___________ (you) favourite season?
5. ___________ season do you like best?
6. I can ___________ (make) a snowman.
7. I eat breakfast ___________ 7: 30.
8. I eat ___________ at 8: 00 in the evening.
乘务员在机车上工作时，应注意哪些事项？
