畜禽体内的必需氨基酸有几种？其中哪几种为限制性氨基酸？

A young man was going to join the army (军队) and had to (41) a medical examination. The doctor was sitting at a desk when he came in. He said to the man, "Take your coat and shirt off and (42) on that chair.
The young man did so. The doctor looked at him for a moment without (43) up from his chair and then said, "All right. Put your clothes on again.
"But you haven’t examined me at ail!" the young man said in (44) .
"There is no need to do so," the doctor said with a (45) .
"When I (46) you to take your coat and shirt off, you heard me all right, so there is nothing wrong with your (47) . You saw the chair, so your eyes are (48) . You could take your clothes off and sit on the chair, so you must be in good health. And you understand what I told you to do and did it without a (49) , so you (50) healthy enough for the army.\

[A] gets[B] getting [C] get

把铁球放入盛满酒精和装满水的杯中，若从杯中溢出8g酒精，若将该铁球放入盛满水的杯中，从杯中溢出水的质量为（　　）（密度为0.8×10³kg/m³）

A．15g

B．12.5g

C．10g

D．8g

2009年5月3日，面对一批即将赴祖国西部和基层就业的清华大学应届毕业生代表，温 * * * * 动情地对他们说：“什么能够使你们的心灵永远明亮？那就是你们的理想和信念，把自己一生献给人民。……这就像一盏明灯，永远在你们心里点燃，而且照亮你们前进的方向，不要退缩。”下列最能体现上述材料的一项是 [ ]

①崇高理想就是人们对未来工作的追求和向往

②崇高理想是人们的精神支柱和前进动力

③有了崇高理想就能实现个人愿望

④崇高理想是社会进步的助推器

A．①②③

B．①④

C．②③

D．②④

杂交稻是利用哪些遗传学理论和技术培育出来的简述杂交水稻研究和利用的现状。

按照《SAS售后服务流程标准之业务操作篇》规定，请按照顺序填写接车流程（）

A、车辆进店，迎接顾客

B、如果顾客同意维修则顾客签字授权、委托维修，钥匙交接

C、记录交修前的车辆状况

D、引导顾客至休息区或送走顾客

E、制作工单

F、倾听并记录顾客描述故障