表示资金存储系数的是（）。
A．A
B．B
C．C
D．D
参考答案：A
Sorry, I am busy today. I have homework to do. [ ]
A. much too
B. too much
C. too many
D. many too
15．– How cold it is! I wonder how grass survive under such heavy snow．
--Don’t worry．There is a lot of air in loose snow which _______．
A．keeps out the cold
B．keeps the cold away
C．keep off the cold
D．keep the cold up
