在测量小石块密度的实验中， （1）如图甲所示，小明在使用天平过程中的错误是： _

语言发展的关键期是在（）。

A.3岁前

B.4岁前

C.5岁前

D.6岁前

E.7岁前

Computers and television have pushed a generation of children towards violent behaviour, and mental illness, a large-scale study said yesterday. Though the main reason for children’s violent behaviour comes from family, the study report also blamed computer games, the internet and television for breeding violence and increase mental illness.

The study report warned of the effects of long hours spent watching television, on the internet and playing computer games. 'There is much evidence that exposure to violent images encourages aggressive behaviour,” it said.

On television, violence is frequently shown as part of a normal human life. The violence is both physical and psychological, and violent argument appears as a standard response to disagreement. To be sure, there is plenty of violence in Shakespeare plays and in the cinema. But people used to go to the cinema once a week, whereas our children now watch television for an average of 17 hours a week.

According to the report, the harm caused by computer and television has been widely recognized, which is only second to family factors including family break-up and the lack of a father living at home.  No doubt, selfish behaviour by adults is mainly responsible for the misery of millions of children.

Many parents’ aggressive pursuit of personal success has pushed the needs of children aside and amounts children’s violent behavior. The belief among adults that the main duty of the individual is to make the most of their own life, rather than contribute to the good of others, is causing our young people a range of problems.

At the end, the report calls for measures to cut the impact of television on young people, including a ban on all advertising aimed at children under 12, set up watchdog equipment on every TV set to control what children watch and put an end to advertising of alcohol and unhealthy food before the 9pm watershed. And more importantly, it calls on all British parents to value the once-in-a-lifetime period of their children’s growth.  Or, according to the report, they will soon regret their absence in that special period when their kids have grown into the “bad guys.”

72. The study is mainly about ______.

A. the family and social reasons for the children’s negative behaviour

B. the importance of a complete family on the behaviour of children

C. the ways to reduce the influence of television on children

D. the relationship between parents and children

73. According to the passage, which of the following statements is NOT TRUE?

A. The major reason for children’s bad behaviour comes from family.

B. Watching too many violent images will cause violent behaviour.

C. Classical works are violence-free so people in the past were not that violent.

D. Many parents put personal success ahead of their children’s benefits.

74. According to the passage, what kind of TV program is more likely to be shown after 9 p.m.?

A. Cartoons for kindergarten children.

B. Gardening programs for housewives.

C. Action movies with violent scenes.

D. Political talk shows for adults.

75.   The passage mentions all the measures to reduce the TV influence EXCEPT ______.

A. advising parents to watch TV programs with children together

B. stopping commercials for little children

C. using a practical method to monitor what children watch on TV

D. forbiding ads for harmful products shown before 9 p.m.

正常肺部X线表现的解剖结构，哪一项错误（）。

A.肺野是由含气肺泡组成

B.肺纹理是主要由支气管组成

C.肺门主要由肺动、静脉组成

D.肺野的横分区是以肋骨为标点

E.右肺门上部有静脉参与构成，下部只由肺动脉构成

患者男性，21岁，腹痛、腹泻3d后，出现四肢无力逐渐加重并向近端进展。查体：额纹及鼻唇沟变浅，四肢肌力4级，双下肢远端痛觉减退，Babinski征(-)。腰穿检查；脑脊液压力160mmHg，蛋白4g/L，细胞数5×10⁶/L，糖3.0mmol/L，氯化物125mmol/L。

该患者应可出现下列哪个临床表现

A．双下肢腱反射亢进，双上肢腱反射正常

B．双上肢腱反射正常，双下肢腱反射亢进

C．双上肢腱反射正常，双下肢腱反射减退

D．四肢均腱反射亢进

E．以上均不是

不属于确定质子空间位置的条件是（）

A.梯度磁场

B.Larmor方程

C.频率编码

D.相位编码

E.傅立叶变换