径为5～7cm的落叶乔木进行裸根起掘时其根系规格一般确定为直径（）cm。
A.50～60
B.60～70
C.70～90
D.80～100
参考答案：B
— Which of these English CDs do you think I should buy, sir?
— ________ You're supposed to have ideas of your own. [ ]
A. It's up to you.
B. That's settled.
C. With pleasure.
D. I've got that.
下列属于TD-SCDMA系统增强与演进的系统是（）。
A、HSDPA
B、HSUPA
C、UMB
D、LTE
