3.5和3.50的意义相同．______．
3.5精确到十分位，计数单位是0.1；
3.50精确到百分位，计数单位是0.01．
故答案为：×．
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
（）的《长安古意》把宫体诗由宫廷带入市井，反映了长安的盛况。
