桃花在花托上有四个部分，从内向外依次是（） ①花瓣 ②雄蕊 ③萼片 ④雌蕊 A．

某项目经理进行工程施工。抹灰组8人，外墙刷涂料施工23天（每天平均工作9小时），完成外墙1980m²。某劳动定额员对2人工作时间进行测定。基本工作时间300分钟；辅助工作时间45分钟；准备与结束工作时间20分钟；不可避免中断时间35分钟；因材料供应不及时导致停式260分钟，人工幅度差1%。

观察和研究施工过程中各种性质的工作时间消耗的方法，称之为（）。

A.工作日写实法

B.测时法

C.统计分析法

D.写实记录法

E.经验估计法

如图所示，一个小铁球从竖立在地面上的轻弹簧正上方某处自由下落，接触弹簧后将弹簧压缩．若压缩过程中弹簧为弹性形变，弹簧的弹力跟弹簧的形变量成正比，则当弹簧的压缩量最大时（　　）

A．球所受到的合力最大，但不一定大于球自身的重力

B．球所受到的弹力最大，且一定大于自身重力的二倍

C．球的加速度最大，且可能小于或等于重力加速度

D．球的加速度最大，且一定大于重力加速度

C

Sometimes we cry because we are sad and sometimes because we are extremely happy．An irritant(刺激物)，such as onion(洋葱) smell or grains of sand in the eye，can also make cry．In this case tears perform an obvious role in getting rid of substances that might harm the surface of the eye．

Dr．William Frey of the Dry Eye and Tear Research Center at St．Paul in Minnesota，USA，believes that tears from emotional causes may perform a similar role．He thinks that crying could get rid of emotional stress by washing away a chemical in the blood caused by strong emotions. To prove his theory, he hopes first to identify this chemical and then see if it is found in tears of sadness or happiness．  

So far, Dr．Frey has failed to find out the difference between emotional tears and tears caused by an irritant in the eye．This may be because these substances themselves cause a degree of stress and emotion．What he has identified in all tears is a variety of biochemicals(生化物)which are one of the causes of stress．A more detailed study may help us understand why sufferers from stress-related disorders cry less often than healthy people．Dr．Frey is also very interested to see if there are any physiological(生理学的)explanations for why women，in general，cry five times more often than men，on average．

64. The main purpose of Dr．Frey’s study of tears is to           

A. show that there are two types of tears，caused by irritants and by emotions

B. find out the cause of stress-related problems and emotional disorders

C. explain why women cry more often than men

D. prove that tears can remove a chemical in the blood caused by strong emotions

65. Which of the following is true according to the passage?

A. Tears fail to help get rid of emotional stress．

B. Irritants in the eye result in tears without causing stress and emotion．   

C. Healthy people cry more often than those with stress-related problems．

D. The biochemical identified by Dr．Frey has nothing to do with stress．

66. We can learn from the passage that __________．

A. crying does us more harm than good

B. inner feelings don’t affect our bodies

C. sorrow may cause some chemicals in our blood

D. emotional tears are different from tears caused by irritants in the eye

67. Dr．Frey believes that tears from emotional causes may play a role in getting rid of ______．

A. emotional stress by washing away a chemical in the blood

B. onion smell or grains of sand

C. sufferings from irritants

D. substances that might not harm the surface of the eye

有关山东省的说法正确的是[ ]

A．农业和工业产生地域产业明显

B．寿光、苍山、章丘、泰安成为著名的蔬菜生产基地

C．家电产业的产值在全国末位

D．工业部门不齐全，工业体系不完整

面部的主要感觉神经是（）.

A.面神经

B.舌神经

C.舌下神经

D.三叉神经

E.耳颞神经