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在缓解和解决IP地址耗尽问题的措施中， (1) 可以把大的网络分成小的子网 (2) 可以实现本地地址和外部地址的转换。例如把子网掩码为255.255.0.0的网络61.31.0.0分为两个子网，假设第一个子网为61.31.0.0/17，则第二：个子网为 (3) 。假设有1000台主机，如果分配一个网络号为202.31.64.0地址，则子网掩码为 (4) ；假设C类网络号为202.31.16.0～202.31.31.0，则相应的子网掩码应为 (5) 。

答案

参考答案：(1)VLSM
(2)NAT
(3)61.31.128.0/17
(4)255.255.252.0
(5)255.255.240.0

解析： 在缓解和解决IP地址耗尽问题的措施中，VLSM可以把大的网络分成小的子网，NAT可以实现本地地址和外部地址的转换。例如把子网掩码为255.255.0.0的网络61.31.0.0分为两个子网，假设第一个子网为61.31.0.0/17，则可知其网络地址为17位，第二个子网地址即为网络地址第17位为1的IP地址。即61.31.128.0/17。假设有1000台主机，如果分配一个网络号为202.31.64.0地址，可以将其划分为包含1024台主机的子网地址，即22位网络地址，则子网掩码为255.255.252.0；因为C类地址网络号为202.31.16.0～202.31.31.0，由202.31.16.0和202.31.31.0分别与255.255.255.255按位相与后的结果可知，其后12位相同，即其网络地址为20位，所以村{应的子网掩码应为255.255.240.0。

完形填空
完形填空(共20小题；每小题l 5分，满分30分)
阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
After winning a big game，athletes are often asked how they feel．Usually athletes say how  21  it is to win this big game．On the contrary，the fact is that losing a big game，or in my case，all the games，can be even harder．
From the spectators’ point of view，last year’s basketball 22 for my high school team was nothing  23  of an embarrassment．And  24  0—20 is certainly nothing to be proud of，that season had a bigger impact on me than any other．As a team captain，I knew it probably wouldn’t be the  25  year，but did I ever think we would lose every game？Of course not．Since six of our top players had graduated，it was clear that we were a (n)  26  team who would struggle．The struggle began earlier than expected，  27  ，as our team center was suspended (禁赛) for the season，and two key members decided to  28  for some reason．At this point，dropping out probably passed through every player’s mind，but in the end，we all stuck it out，  29  to work still harder．
Then there came a time when even our  30  had given up on us．Personally，I felt like it was  31  worthwhile giving my all．I thought，if even the coach doesn’t believe in us，why should I？But just as my hope began to  32 ，a teammate called a meeting．He said，“Nobody thinks we are going to win，but，as teammates and friends，we  33  it to each other to go all out every game．”
It was that moment that  34  me how to be a leader．It hit me that I certainly didn’t 35  the role．As a leader you can never quit  36  the team who looks up to you．It is one  37  to be named captain，feel great and go through the motions，but it is quite another to be a real captain and make sure everyone realizes their full  38  all the time．
I am sure it is great to go through without losing and bringing home awards．But in all honesty，I  39  the fact that my team lost every game last year．It may not help me to become a better basketball player，but it already has made me a better leader，and  40 ．
小题1:
A．excitingB．pleasantC．toughD．significant
小题2:
A．gameB．eventC．leagueD．season
小题3:
A．shortB．fullC．lackingD．sufficient
小题4:
A．asB．whileC．sinceD．now that
小题5:
A．most interestingB．dullestC．most difficultD．easiest
小题6:
A．uniqueB．adventurous C．youngD．untraining
小题7:
A．meanwhileB．thoughC．insteadD．somehow
小题8:
A．quitB．stayC．resignD．rest
小题9:
A．hopingB．swearing C．claiming D．wishing
小题10:
A．fansB．classmatesC．teachersD．coach
小题11:
A．only tooB．more thanC．not a littleD．no longer
小题12:
A．fadeB．gainC．destroyD．grow
小题13:
A．oweB．think C．demandD．recommend
小题14:
A．remindedB．toldC．taughtD．guided
小题15:
A．actB．deserveC．makeD．take
小题16:
A．withB．alongsideC．on D．for
小题17:
A．matterB．aspectC．issueD．thing
小题18:
A．potentialB．goalC．enthusiasmD．confidence
小题19:
A．hateB．treasureC．admitD．recognize
小题20:
A．characterB．captain C．personD．coach
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选择题

已知温度T时，水的离子积常数为KW，该温度下将V1mL a mol/L的一元酸HA与V2mL b mol·L-1的一元碱BOH充分混合，下列判断一定正确的是

A．若V1a=V2b，稀释此混合溶液时，溶液中各离子浓度一定都发生变化

B．若pH( HA)+pH(BOH) =14，则V1=V2时，酸碱恰好完全中和

C．此混合液中:  c( H+)+c(B+) ≤ c(OH一)+c(A一)

D．若混合溶液中。c(OH一) =√KWmol·L-1，则此溶液一定呈中性
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