世界卫生组织（WHO）于1973年将盲与视力损伤分为五级，请简述这五级的分类标准。

沃尔夫在1935年写道：“（它）公认是科学史上最伟大的著作。……二百多年来，它一直是全部天文学和宇宙学思想的基础。”他所指的著作是 [ ]

A．牛顿的《自然哲学的数学原理》

B．达尔文的《物种起源》

C．赫胥黎的《人类在自然界中的位置》

D．爱因斯坦的《论动体的电动力学》

做匀变速直线运动的小车带动纸带通过打点计时器，打出的部分计数点如图所示．每相邻两点间还有四个点未画出来，打点计时器使用的是50Hz的低压交流电，设1、3，2、4，3、5，4、6，5、7两点间的平均速度分别等于2，3，4，5，6几点的瞬时速度．

求：（1）打点计时器打点“2”时，小车的速度为______；

（2）小车的加速度为______；（结果保留三位有效数字）

对于情节较为严重，但尚未给客户造成重大损失的情形，应给予执业理财规划师（）制裁措施。

A.警告

B.暂停执业

C.罚款

D.吊销执照

Marriages improve after children grow up and move out，according to an academic study，

which suggests an“empty nest”is not always a bad thing．

Popular wisdom has it that parents’relationships may suffer once their young fly the coop，

because they feel they have lost their purpose in life．However,a new study by researchers at the

University of California,Berkeley，has found that many couples actually feel happier when their

children leave home because they are able to enjoy spending time together．

In total，123 American mothers born in the 1930s were tracked for 18 years and asked to rate

their satisfaction levels shortly after marrying,when they were bringing up babies，once their

children reached their teenage years and finally at age 61，when almost all had“empty nests”．

Although not all said they were happier in general，most claimed their marriages had improved since their children had left home．Researchers believe this is not just because the spouses were spending more time together,but because they were able to enjoy each other’s company more．

One of the participants in the study,which is published in the jourmal Psychological Science，

said：“Once the kids grow up…there’s some of that stress removed…that responsibility removed，so things are a little more relaxed．’’

Psychologist Sara Gorchoff,who carried out the investigation，said：“The take-home message

for couples with young children is‘hang in there’．”Her co-author Oliver John added：“Don’t wait until your kids leave home to schedule quality time with your partner．”   

However,Dr Dorothy Rowe，from the British Psychological Society，said the effects of living

in an“empty nest'”will depend on the parents’relationship with their children．“If yod’re just

waiting for them to leave home so you Can get on with your life，then of course you’11 be pleased to see them go，”she said，‘‘But if you’ve built your life around your children you’11 be terribly lonely．”For some parents，their world falls apart when their Children leave．’’

72．It is commonly believed that            

A．marriages improve after children leave home

B．an“empty nest'’is always a happy thing

C．parents’relationships may suffer once their young grow up and move out

D．parents will be pleased after their children leave home

73．When did many couples feel happier according to the study?

A．At age 61．when almost all had“empty nests”．

B．Shortly after marrying．

C．Once their children reached their teenage years．

D．When they were bringing up babies．

74．Marriages improve after children fly the coop not because         

A．many couples are able to spend time together

B．many couples arc able to enjoy each other’s company

C．things are a little more relaxed

D．many couples needn’t work at all

75．The author ofthe passage tends to agree that          ．    

A．parents should build their life around their kids

B．parents should schedule quality time with each other before kids leave home

C．parents’relationship with their kids has no effect on marriages at all

D．parents should be pleased to see their kids leave home

一副扑克牌有52张，最上面一张是红桃A。如果每次把最上面的10张移到最下面而不改变它们的顺序及朝向，那么，至少经过多少次移动，红桃A会出现在最上面( )

A．27
B．26
C．25
D．24