问题 单项选择题

动物园里猩猩比狒狒多,猴子比猩猩多。一天,饲养员拿了十箱香蕉分给它们,每只猩猩比每只狒狒多分一根,每只猴子比每只猩猩多分一根。分完后,只剩下2根香蕉。如果每箱香蕉数量相同,都是40多个,而且猴子比狒狒多6只,猩猩有16只。那么,动物园里有多少只猴子( )

A.18
B.19
C.20
D.17

答案

参考答案:B

解析: 设猴子的数量为x只,每只猩猩分y个香蕉,香蕉总数为N,
则猩猩分到的香蕉为16y,猴子分到的香蕉为x(y+1),
狒狒分到的香蕉为(x-6)×(y-1)
所以有x(y+1)+16y+(x-6)×(y-1)+2=N
2y(x+5)+8=N
猴子比猩猩多,猩猩16只,猴子最少17只,猩猩比狒狒多,狒狒最多15只,猴子比狒狒多6只,猴子最多21只,所以猴子的数量应在17到21之间。
则上式有如下可能,
44y+8=N
46y+8=N
48y+8=N
50y+8=N
52y+8=N
其中N是10的整数倍,介于410—490。
则N能被10整除,44y+8也能被10整除,继而推出44y除10余2,可取3、8,代入44y+8=N,N值小于400,不符合题意。
依次类推,当y=9时,48y+8=48×9+8=440,符合题意。
猴子数为48/2-5=19只。符合题意。
故本题正确答案为B。

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。   

Body language is the quiet,secret and most powerful language.Of all.It is said that our body movements communicate about 50 % of what we really mean while words themselves only express 7%.So,while your mouth is closed,just what is your body saying...

Arms.  小题1: If you keep your  arms to the sides of your body or behind your back this suggests you are not afraid of taking on whatever comes your way. 小题2:  If someone upsets you,just cross your arms to show you’re unhappy.

Head.When you want to appear confident,keep your head level. If  you are monitor in class,you can take on this position when you want your words to be taken seriously.小题3:

Legs.Your legs tend to move around a lot more than normal when you are nervous or telling lies.If you are at interviews, try to keep them still

Posture.A good posture makes you feel better about yourself. 小题4:This makes breathing more difficult,which in turn   make you feel nervous  or uncomfortable.

Mouth.When you are thinking,you often purse(皱拢)your lips.You might also use this position to hold back all angry comment you don't wish to show.  小题5:

A.If you are feeling down, you normally don't sit straight, with your shoulders inwards.

B.If you are pleased, you usually open your eyes wide and people can notice this.

C.Outgoing people generally use their arms with big movements, while quieter people keep them close to their bodies.

D.How you hold your arms shows how open and receptive you are to people you meet.E. However, it will probably still be noticed, and people will know you’re not pleased.

F. However, to he friendly in listening or speaking, you must move your head a little to one side.

G. Don’t say too much when you're happy,

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