奶经过超高温巴氏消毒的目的是()A．杀灭所有微生物 B．杀灭乳酸菌 C．杀灭致病菌

原计划1台拖拉机7天耕地224亩，现在4天耕地152亩。照这样计算，7天可比原计划多耕多少亩地？正确的列式是[ ]

A.  152÷4- 224÷7    

B.  152 - 224÷7×4     

C.  152÷4×7- 224    

D.（152+224）÷（7+4）

一个质量为3kg的物体在半径为2m的圆周上以4m/s的速度运动，物体运动的向心加速度是多大？物体做圆周运动的角速度是多大？物体做圆周运动所需的向心力是多大？

下列各地中，年降水量少于400毫米的是[ ]

A．银川

B．拉萨

C．太原

D．西安

D

Annual holidays have become a luxury and are no longer a staple of family life, according to government research.

A getaway of a week or more is no longer considered essential by many families and is often beyond their reach, said the analysis of what parents and children say they really need. Fashionable clothes for the children, expensive birthday parties and lots of toys are also on the list of luxuries families don’t have to have. Instead, recession-hit parents are thinking of the future, and the things they want for their children centre around learning to behave properly, good education and good health.

Their picture of what a family ought to have includes a space to eat together away from the television, plenty of fruit and vegetables, and bicycles so children can get exercise.

The breakdown of necessities and luxuries was prepared by researchers from the Department for Work and Pensions(DWP) who were trying to establish an up-to-date picture of what parents say they really need.

Their findings show how families have scaled down their expectations in the face of economic difficulties — how parents are now concentrating their attention and money firmly on the long-term interests of their children. Many believe that while it is vital for a family to do things together, day trips or weekend breaks are enough.

Spending on furniture or decorating the house was also considered luxurious, unless the state of the home was so bad it became difficult to invite visitors in.

Instead, researchers said: A family home should have an area where the family can eat together, not on their laps in front of a television. Families should be able to go on outings, overnight trips and possibly short holiday: the fact of being able to share these experiences is more important than the precise activity and its cost.

71. It can be inferred that ______________.

A. a week or more holiday is considered beyond many families’ reach

B. children hardly ever need fashionable clothes and lots of toys

C. what a family should have is basic things that they must have

D. annual holidays were once considered necessary and vital

72. In the opinion of most parents, _____________.

A. families can watch TV together in order to keep up their relationship

B. day trips or weekend breaks are enough for families to share experiences

C. their expectations should be increased in the face of economic difficulties

D. a week’s holiday is an essential minimum during the financial crisis

73. Which of the following is TRUE of the researchers from the DWP?

A. They confirm many families still need at least a week away on holiday each year.

B. They learn it is insignificant for a family to do things with each other regularly.

C. They want to know what parents really need in the face of economic difficulties.

D. They found spending on furniture or decorating the house was thought valuable.

74. We can conclude from the last paragraph____________.

A. being able to share experiences is important for families

B. a family needs at least a week away on holiday each year

C. a family home should have a comfortable area to watch TV

D. going on outings and overnight trips is wasting time for families

75. What does the author mainly discuss in the text?

A. Cycling is very important for children’s health.

B. Family holidays once a year have become a luxury.

C. It is vital for parents to eat together with children.

D. Parents are concerned with children’s future.

产妇，女，33岁，汉族。妊娠前曾输同型血400ml。曾有怀孕2个月流产3次，8个月早产死胎1次。现为第5次怀孕，8个月时因有早产征象住院保胎。经药物治疗维持到妊娠36周时行剖宫产，患儿出生后12小时出现黄疸，Hb120g/L，RBC3.45×10¹²/L。产妇血型为0，CCDee；丈夫血型为A，CCDEE，患儿血清仅与5份含E抗原阳性的红细胞在酶和抗人球蛋白（AGT）介质中反应，在盐水介质中不反应，而与5份E抗原阴性的红细胞在三种介质中均不反应。

患儿的血型可能为（）

A.A，CCDee

B.0，CCDEe

C.0，CCDee

D.A，CCdee

E.0，CCdEe