时间序列预测法的特点有（）。
A.假设过去可以影响未来
B.受综合因素影响
C.以时间为主要分析指标
D.受单一时间因素影响
参考答案：A, B, C
在○里填上“>”“<”或“=”。
10÷5○5 5+5○25 4÷1○1
12÷3○4 16÷4○4 9÷3○3
3÷3○3 8÷2○8-2 25÷5○6
---Would you like to go to see a film with me tonight?
--- _______ , but I have a visiting friend now.
A．I would
B．I'd like to
C．I'd be happy
D．I'd prefer
